The 4k enhancement, which most people will buy this for is very good.

According to other articles, the fastest input lag with 4k enhancement on is 28ms.

When viewing 1080p blu ray material, there is a noticeable difference when switching the 4k enhancement on and then off.

I was skeptical at first on the difference the 4k enhancement would make

The 4k enhancement and the other onboard picture processing result in a picture much sharper and cleaner than my previous JVC projector and on my samsung led tv

The 4k enhancement really does work

Actually prefer the look of DLP but could not afford $50K for a new 4K 3 chip DLP projector.

I'm back here to tell you that if you want to take advantage of the 4K enhancement (HDR) for this projector you'll need the Phillips 4K player (only it puts out a signal in the range this projector needs to put the best possible 4K image on your silver screen).

There is a motor involved in the 4K pixel shift or "4K enhancement", this means you might be able to hear a light hum/buz in very quiet conditions

In clear, as a 1080p it is wonderful, as a 4K, it find it disappointing

You are not going to get a perfect 4K, but I hardly notice the difference anyways

UPDATE: 09-18-2017After much fussing and trying out all three 4K capable blu-ray players (Samsung, Phillips, & Sony) on my own

If I use the "Native" resolution, the 1080p contents are scaled up to match the 4k resolution and the image is not as good as with the Epson 2040 which has a native resolution of 1080p and does not do any scaling

The UBP –x800 player is also highly recommended as it is quick and easy to use with some great features