Here are my renders,those renders I've done on my friend PC with my GPU's(GTX Titan X and GTX780)

First render took around 1 hour and 45mins and samples I've set at 250 I think

And V4 with textures adapted for Cycles,I didn't have lots of time to play,looks OK,but still I'm not very happy with few bits,render not sure,but has been pretty much quick,I've used progressive rendering

Same render,but I've used Gimp for postwork

Thanks,Jura