Originally Posted by 42Plasmaman
1. The X70 black levels were indeed blacker but not a night and day difference where I was saying wow.
The contrast measurements reported show that the X70 is substantially more than the 8700UB(5010 equivalent contrast) but to the eye, it seems contrast increases is not seen in a linear fashion when black levels hit a certain point.
Maybe the difference/ratings are logarithmic after you hit a certain point of contrast?
To some extent, yes, there is obviously a lot more difference between 10,000:1 Native and 1,000:1, then even 60,000:1 and 10,000:1, but where the JVC excels is in certain types of scenes that give IRIS's problems. It's not so much that the blacks will look a lot darker, but it's also that the whites look better while the blacks are still dark. You would need to split-screen certain content.
The 8700ub is no slouch in black levels and is the best bang-for-buck projector out there. As far as sharpness goes, the 8700ub's I've personally seen can't quite match the sharpness of my RS-45 which is only 0.3 pixels off after warmup, but the difference isn't that noticeable in most video content (a little in HD documentary type stuff). The JVC is very sensitive to lens shift and warm-up time and focus as to how it is affected by convergence, more than the Epsons, but it's mostly only because the Epson's usually start of with slightly more inaccurate convergence. The correction feature on the 5010 should help this some, and the 5010 I saw was sharper than the 8700ub's I've seen (so good news there).
IMO, most JVC's are exceedingly sharp this year, I've discussed it with a few people that have seen multiple JVC's, only a handful even needed a pixel correection, sounds like you saw one that did. The JVC RS-45 allows 1-pixel correction, the RS-55 allows 1-pixel and sub-pixel correction.
My JVC is off less than 0.5 pixels across the entire screen at its optimal mounting position. In some areas it is off 0.1 pixels, in others it is off 0.3 pixels. I can't speak to every JVC, since I have one with very good convergence, but if you get lucky like I did (and I think with the JVC you're more likely to get lucky on convergence), then you'll get an image as sharp as many DLP's for the most part.
The 8700ub is a great projector though, and for the price you can't go wrong.
The main reason to get the 5010 over the JVC is 3D brightness, less ghosting. The JVC has a slightly smoother look to it and a more refined image for film, but it depends on what you watch. The Epson has better FI than the JVC, and since it is brighter in dynamic mode, the Epson is more versatile and again much better at 3D. If you play a reference level movie where the camera men are very skilled (like Tree of Life, maybe even Star Wars Revenge of the Sith, LOTR, etc..), those are the types of movies that the JVC does really well at.