As we’ve already said, Batman: Return to Arkham is not coming to the PC. Gearnuke has shared some comparison screenshots between the UE3 and the UE4 versions of Batman: Arkham Asylum and Batman: Arkham City. In addition, NeoGAF’s member ‘MilkyJoe‘ shared some additional comparison screenshots between the original and the remastered versions of these two titles.
Do note that these comparison screenshots are based on the official trailer, and are not direct feed comparisons. In other words, there are video artifacts that can be easily noticed.
The UE3 images are on the left, whereas the remastered UE4 screenshots are on the right.