Nobody has mentioned motion issues specifically with JVC, I'm not sure why that has been implied. I did ask if I could expect improved motion over an Epson (9300/9400) on a JVC/Sony given they use the same underlying technology to resolve the image. I find the Epson experience blurry when using their 4K shifting which also lacks interpolation options. When panning a scene or walking with a moving background it falls apart for me.
Clearly we have some justification for JVC purchases that will bias the question, I'd fully expect the same if I asked over in the Epson thread. My point was only if it's expecting more from the underlying tech across brands than I reasonably should, and beside some (possible) massive difference between an Epson and JVC in other areas, motion might be similar. I'd expect some improved clarity with the JVC/Sony being native, but was secretly hoping for a straight out, yes, vast difference, due to 'X' on the Epson. Perhaps Sony with their motion handling notoriety will provide a far more pleasing experience over the Epson range, maybe the JVC, I really don't know.
I'll certainly try and catch a demo as nobody seems able to confidently suggest one way or the other if a larger difference can be expected over the Epson. Though I fully appreciate motion can be subjective and perhaps on the whole people are as happy with Epson motion as they are JVC/Sony and there really isn't anything in it.