I dunno a lot of benchmarks say the 980m has better performance then the desktop 770 so if you got a high end gaming laptop it could give you the desktop experience, anything from 780m+/870m+/960m+ should have perfectly usable performance. I use a laptop(that’s slowly dying:() but its good enough for small 3D or 2D projects.
I don’t yet but I ordered an with a 980m on the 26th which should arrive soon(fingers crossed;)) so I could let you know the performance once I’ve tested it, also someone said they’ve tried an asus rog with 980m and they had good performance in UE4.