Interesting question. I don't know how many 1st hand reviews you will get here as I don't think many people have anything above 720p, myself included. Sirquack may have some insights as he did at least a little looking at the Z2000 as an upgrade from his Z2.

I am sure that you know about it, but Projector Central is great resource for information.

Here are some links for everyone:

Sanyo Z2000
Specs
Review

Epson PowerLite Home Cinema 1080
Specs
Review

Panasonic PT-AE2000U
Specs
Review

Farewell - June 4, 2020