What I said on Eurogamer:
Anyway bring on the game, will pick it up tomorrow. Without HDR providing any benefits I won't have to bother removing the breakout box every time. hdmi 1.4 is plenty for 4k checkerboard.
Pro and X do have higher quality textures at least, in addition to the resolution upgrades. I definitely think X is worthy upgrade over standard XB1, the standard XB1 version of RDR2 looks quite blurry.