Unreal Engine 4? Thought the abbreviation was UE4
OT: Maybe a Lenovo Y700? I own the old-old-older brother of it the Y510p and it suits me well for programs like 3DSMAX, Unity 3D. But I didn't test it with unreal tho, might aswell install it and see if i'm able to run it. Anyway, the Y700 is built better than the 7559 and it has identical specs with the current gen, but it won't getting any updates ( i think ). Are you in a hurry to buy a new laptop ? Otherwise, wait for the 7559 update to get a bit more performance ( won't be a lot tho, expect 5-10% more than skylake ).