The Iray render on the left isn't low resolution. It seems like it may just be the lighting that;s low res. The preview and the card render are fine and smoothed, though uglier. In Iclone it looks only a little better because I maxed out the subdivision. It's happening only with this character, and I re-imported him. 

Here it is in Iclone.


And here is his female counterpart, made with the same texture. No problem.