Headphones

I have owned a pair of AKG K501 for years. I never really liked them as I found them to have a magical midrange, their bass was lacking. I just got a cetrance DAC/headphone amplifier, and I changed my opinion. They now do everything I want. Wondering whether any of the newer AKG 7XX )701,701, 712) will give significant improvement? I also have Sennheirser 700  and Shure 1541.
I know this is the speaker forum, but there is not a headphone forum.