nx500

hello I am deciding between gh4, nx500 and 760d. I already used 760, 5d, eos m3, 500d, 700d, hdr fx7, fx1000e, arri amira, black magic ursa and sony a77 I only have 5D, M3, 700d and 500d. I think 760 is sharp enough and a little bit good in low light. gh4 records 4k but I will downscale it...