Just purchased an RS420 this morning yay!
I posted this in return to a comment on the Epson 6040 thread, thought I'd post my experience here, too:
My wife and I were just at Magnolia yesterday and had a chance to demo the Sony 65es, Epson 6040 and JVC RS400 (x550r). We viewed them in that order, over and over with the same BD content (X-Men First Class in 1080).
Unfortunately, the way that Magnolia has their store set up is that each projector is in a completely different room with completely different lighting (& sometimes ambient light) and with not only different screen vendors, but sizes and materials, as well.
Sony 65es @ ~14' throw onto a 100" SI Series 1 white screen in a completely dark room
Epson 6040 @ ~12' throw onto a 100" Stewart Firehawk ALR screen with minor ambient light (solar shades)
JVC x550r @ ~14/16' throw onto an SI Series 3 white screen w/no control over ambient light (store overhead lights coming through an open doorway in the "living room" setup)
We were told that each of the projectors were in cinema mode on high lamp mode, but they couldn't find the remotes to confirm on either the Epson or JVC.
Unfortunately, I could go on and on about the differences in picture, contrast, sharpness and color, but due to not knowing the hours on the bulb, the differences in screens, ambient light, etc. we left more confused than when we entered.
Ultimately - I placed an order with a dealer on this site this morning for a JVC rs420. Why? The 2017 model has the low input lag for gaming; Every dealer and friend that I spoke with told me I'd have buyer's remorse with the 6040. The reviews and threads that I've read haven't put it that bluntly; it really does appear to be a toss-up between the two. I continued to lean towards the Epson, mainly for the picture brightness and inclusion of mount and extra bulb in the price, but was able to pick up the JVC for a deal that I couldn't pass up.
I'm sure they're both great projectors once calibrated and I don't envy anyone else making this decision If you want to follow my findings with how the rs420 is - check out the rs420 owner's thread in a week or two.
Unless these 2 are side by side I think they're both a great choice.
Media Room: JVC DLA-RS420, ST 125" 2.35:1 screen, Denon AVR-x4300h, Outlaw Audio 7125, Sony UBP-X800, Klipsch RF-7ii fronts, RC-64ii center, RS-62ii x2 surrounds && RS-41ii x2 backs, HSU VTF-3 MK5 x2 subs, Micca M-8C heights, ATV 4K
Living Room: 65" Sony XBR65X900E; Sonos Playbase