Nearly 25 years after it was published, a fun surprise was discovered inside an unsuspecting Japanese Mega Man X4 guidebook. Apparently, it features several frames from the game's animated cutscenes in full 4:3. These scenes were presented in 16:9 in the game itself, leaving some finer details cropped out of frame (such as the pool of "blood" from Double's victim).
Let's have a look...
By way of MMcflies:
And some interesting comparisons shots: