I had the G700M2 for 30 days last year and agree about how good it is. In audio, you are always chasing the last 10-15% and that's the case here. Quoting the maker of some extremely expensive high-end speakers about the R-1000 vs the G700MK2, "Is it better? Yes. Is it 3x better? No". He recommends the G700MK2 with his speakers all the time when you chat with him in person.
I sprung for the SU-R1000 because I wanted the improved phono stage and the improved bass weight of having a power supply for each channel. From a geek perspective, I also like having the GaNFET in the output stage transistor, rather than the MOSFET in the 700. That said, all the improvements are incremental and if I ever scaled down, I would be happy with the 700MK2.
When I had the G700MK2 in-house, a friend of mine was really interested in the possibilities of the Technics models but had talked himself out of racing over to buy one of the few he could find at that point (BTW, distribution is still wonky). I owned the same speakers and after trying it in my setup, I told him he absolutely needed to check the 700 out. He did, loved it and now owns the R1000. And it's not a speaker pairing that makes sense on paper (which just upholds my working model of buying equipment these days, if I can't hear it in my system first, I don't buy it).
These are both great integrated amps that do things I've never heard in my system before. Both are bold products that dare to do things differently. And most importantly, the implementation of everything they have going on in these units seems to work so well in unison. Can you run out and buy either the Atmasphere or Audion GaN monoblocks? Sure. I imagine they are both great. But you don't get all the other features that come in one box from Technics.