Cool. What's the best boost enhanced game?
That depends on your tastes. But the answer to "what game is boosted the most" is probably
Battlefield 4. Both campaign and multiplayer are affected, with the latter sometimes seeing huge jumps.
Project CARS is notably improved, too. Honorable mention might be
Just Cause 3. The bump isn't quite as sizeable, but the game was starting from lower. For many folks Boost raises the framerate from "unplayable" to "okay"--not spectacular, but at least allowing for some fun.
So The Division is native 4K now? Pretty surprising as that's a 4x resolution increase at same framerate and slightly better shadows/reflections while looking as good as it does.
Other examples that do native 4K over base PS4's 1080P either aren't as complex visually or drop to 30FPS. Infinite Warfare is an exception but it's not native 4K all the time, but then again the base version isn't 1080P all the time either.
Part of the explanation is probably existing headroom on PS4 all along.
The Division runs 1080p30 on Xbox One (the resolution is dynamic, but not overly prone to dropping). PS4 Pro is more than 3x as powerful, so the resolution gain is a little less shocking.
It's also possible Massive is using clever tech and not true native 4K. But if they are, I at least can't tell from any of the assets I've seen. If people have evidence otherwise, I'm willing to check it out.