I searched for the last 30 minute and found no evidence of Epson's Native Contrast anywhere close to the JVC's.
So the JVC's entry level X590 is still ~40,000:1 Native Contrast, and is currently the same price as the Epson 5050 in Canada(Eastporters)
This is almost same situation I was in almost 3 years ago,
When the Epson 5040 first came out and I was swayed to JVC X550/RS400, That was actually cheaper in Canada.
(To replace my 8 year old Epson with 13,000 hours on it, and on its 5th replacement lamp)
I ended up with the next JVC model up when Eastporter's offered up the X750/RS500 with a free spare lamp for a killer price.
I came to AVS for opinions and I believe it was
that confirmed the X750 would give me
3X the native contrast over the X550/RS400 ...and that my blacked out room would definitely show a dramatic improvement.
JVC Blacks and LCOS will always win out for me,
More lumens have no appeal to me at all, I have a min 12' throw to a 120" 1.3 gain screen and only need low lamp mode.
Iris manually clamped down -10 for Rec.709, wide open for HDR content with Custom Gamma Curves.
Long time Pioneer Kuro owner, and moved to OLED for 4K
...and always hated LCD TV's for their Grey blacks.