Really cool looking. The main crit that stands out to me is your specular colors all look to be pretty much saturated brighter versions of your diffuse. Also the dark red plate on his belly looks oddly solid-colored compared to everything else.
I think you have great detail on the sculpted one but your choice in colors and the amount of contrast your putting in them is taking all that detail away. try putting more contrast through the specular than the diffuse i think that will punch up your detail significantly
He looks really nice. The silver metal seems off to me though, I'd almost like to see the metal a little darker in the diffuse so you can see the specular on it better. It would also be nice to see some variation in the metal, right now the heavy metal armor and the smaller metal buckles are the same.