Without ado and after about 100 frames, therefore highly provisional...
I like it but it is a bit noisier than I was expecting. There's even a hint, tiny, of banding at mid (3200) ISO but that might be an exposure issue, because the 'blinkies' panic much much too early, encouraging one to underexpose. In general, using the multi meter seems never to actually overexpose but often to warn you that it has.
Files don't respond well to Clarity in LR - they quickly break up in not-a-good-way.
For some weird reason I find that 60/0.7/70/20 for sharpening works well but that even at lower ISO, a touch of NR seems to clean the files up without removing significant detail. I need to do a lot more exploration on this.
WB seems to me more than usually tricky and I will use a WB card when it matters.
It shows the weakness in lenses like crazy. Even my treasured 16-35 looks asymmetrical and a bit stressed in ways I never noticed before. But the 55mm F1.8 works superbly.
It feels great and the shutter is SO much nicer.
More to come, if anyone is interested, as I explore - though I do think that these things take weeks rather than days to clarify in one's mind....