This past week I had a chance to calibrate another RS4910, this was a fantastic sample, convergence was one of the best i've seen out of the box. I also recently calibrated the X35/RS46 (another nice sample) so I decided to run them in an A/B stack with a split source to see how they compare. I usually run around -7 on the iris.
using a number of scenes from Skyfall and Oblivion (2 of my favorite reference BD's) it was harder to discern between the 2 than most would think. I really needed a full, extended fade to black to see the difference. With a quick changing APL scene like the interrogation scene in Oblivion, this can trip up the 4910 iris a bit so it takes a second for the iris / dynamic gamma to kick in and then can blow out the highlights when returning to TC in the chair. I then turned to the first 10 minutes of Underworld Evolution which looks excellent with a good gamma cal. Both projectors performed great and while I did see the iris physically moving around I didn't see a very noticeable difference in the actual image when going back and forth. The end of Skyfall / battle in the mansion is a very dark scene and the 4910 clamped down a good bit and had some advantage here but the X35/RS46 held it's own quite well. .
turning to e-shift, this was interesting. I sit 1.25 sw (~14ft) from the 142" 16:9. Both looked basically the same with e-shift off and with the e-shift set at the default setting, you get the typical analog look that e-shift provides with a bit of softening of the overall image. Close up, I would think I would prefer the e-shift on, it looks better imo than the 'chunky' pixels of the native 1080P image. seated though, I found myself preferring it off as I wasn't seeing the advantage at this distance and it looked a bit softer during the A/B process.
there's no doubt the 4910 is one of their best model built in this chassis that dates back to 2010 with the RS40. Having said that, a good sample entry model from last year is no slouch either and overall closer than I would have though. For 3D, 4910 wins mainly for the CMD, something we should have had since the RS40 was released.
I think many are looking forward to what JVC has in store for fall 2015. Only 10 long months to go.
PS. e-shift 1 FTW...