Honest question about cartridge vs. turntable performance.


I’ve been a vinyl lover for a few years now and I have an ortofon black cartridge setup with an mmf 5.1 turntable with acrylic platter and speed controller. My question to all the vinyl audiophiles out there is this. How much difference does a turntable really make compared to the cartridge? Will I hear a significant difference if I upgraded my turntable and kept the same cartridge? Isn’t the cartridge 90%+ of the sound from a vinyl setup? Thank you guys in advance for an honest discussion on this topic. 
tubelvr1
Mijostyn, I have long ago moved on from the Nottingham, after having also moved on from the Sapphire. Each of my five turntables in current use is either direct drive or (one) idler drive, a very highly modified Lenco, which really only uses the platter, the motor, and the idler wheel from a Lenco L 78. With all due respect to Sota  turntables, for you to talk about a Dohmann turntable with a built-in minus K platform or to talk about any spring suspension in the same breath with a minus K platform is a bit off the deep end, don’t you think.? The minus K is light years more advanced than any common spring suspension found on a turntable. And the Dohmann is indeed a world-class turntable if you have $40,000. I don’t categorically choose direct drive over belt drive, I only claim that for the same amount of cash investment, you get much more bang for the buck out of a direct drive turntable. And even if you have and are willing to spend the bucks, the dohmann and only a very few others actually give you value for money. Most of the rest of them are just bling exhibits. Your ad hoc arguments against direct drive just don’t hold water.
Atma-Sphere, I have this nagging itch that tells me it is the "less money"
part that is most significant here. Now, I have not had a recent direct drive in my system for comparison's sake and to be real It would have to have the same tonearm and cartridge to be meaningful. It is a hard comparison to make. We did do this at Sound Components back in the late 70's, early 80's and the results were uniformly disappointing as far as direct drives were concerned. Theories abounded but nothing was ever proven. 
I have zero interest in the SP10 however I would love to be able to listen to the Grand Prix Audio Monaco and the Xact Audio Beat under similar circumstances. Both are even more accurate and both go to length to mitigate magnetic interference with the cartridge. However at this time if I were to purchase a turntable it would be the Dohmann Helix, just another belt drive. 
Chakster, take it easy. It is already obvious that you and I occupy alternative realities. I said your logic was faulty in that you can not compare cutting a record to playing one back as the parameter are substantially different. 
Yes, there are low torque and high torque direct drive tables. I would bet my wife that all the motors used in Lathes are high torque.
Now I have never used your Microseiki turntables but I find it interesting that their chief designer now makes only belt drive turntables. (Techdas)
A thin platter and a rubber mat are not much for shielding. The best shield from magnetism is distance. 
Neither of us is going to change the other's mind. We present our arguments in a gentlemanly fashion and let others decide for themselves.     
There never was anything special about M-S DD turntables in the first place.  By and large, they are cheaply constructed. They made their bones by building enormous metal belt drives. Hence the fact they are now making Techdas, some of which have the same design flaws as did the original and still highly sought after and still very expensive M-S belt drives.  One model even looks the same as one of their earlier belt drive efforts. 
Yes lewm, no matter how hard I try I can not warm up to Techdas tables. There is just too much filigree. They are beautifully made but more complicated than they have to be and complexity buys unreliability. For that kind of money I expect a turntable to out live me. As an example look at the SOTA Cosmos for less than 1/10th the cost of an Air Force One you get all of the same features, vacuum hold down, a suspended platter (magnets instead of air), an isolating suspension and electronic motor control. Is the Tecdas 10 times better? I would bet with the same tonearm and cartridge most of us would not reliably be able to tell the difference. Is the Techdas more reliable. I doubt it. On the other hand SOTA is right close by and has a great reputation. 
If I were going to spend crazy money on a turntable right now the Dohmann Helix is the one. It accomplishes everything I expect in a turntable in the most elegant manner at the highest levels.
Chakster, in order for any turntable to be first class it has to be able to maintain speed in spite of any reasonable interference, it has to have an adequate record clamping system either reflex or vacuum, it has to be able to mount any tonearm you desire and it has to have a suspension that isolates it from anything over 2 hertz both vertically and horizontally. 
No direct drive turntable I know of meets all of these requirements.