Congrats on the move to UE4! I think this is nothing but good news for your project, and I'll bet you folks won't be able to leave that engine once you get settled in. I've played with quite a few in my time, and UE4 is the most artist-friendly and flexible engine I've ever seen.
UE4 Model Pipeline: Export as FBX, Click import.
Other engines: Get special tools for your 3D or 2D software. Conform your work to the engine's expectations. Fight to use the over-complicated tools. Import your asset just to find it is horribly broken because you missed step 314.
Have fun!
Aurel_Tristen
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