Is the Ortofon Kontrapunkt A compatible with MMF-7

Eh, I'm not too sure about this. I used to have the mmf7. Just sold it last month. knowing what I know now, there is no way I would invest in a $600 cartridge for the mmf7. No way.
That said. If you have $600 you are willing to invest. I would sell the mmf7 and add you $600 to your funds to buy a better TT. I sold mine, and added $450 to step up. I would never look back. Has to be one of the best things I did.

First I want to say that I would never call anyones equipment junk or crap.
With that said, I had the MMF7 for about 10 months. It was great in the beginning. Then it grew old for me. I didn't like the cartridge and looked at my options. Here is the option I chose. I sold the MMF7 for $750. I bought a Vpi HW19jr w/audioquest pt6 tonearm for $775. I bought a Grado Reference Sonata cartridge for $416 inc. shipping.
So, for less than $450 which I would have spent minimum on a new cartridge. I got a TT that I feel is at least twice if not three times better than the MMF7.