great work, 2 comments in order to add more photorrealism
1 - increase the samples to elimanate the moire patterns in that tube in the body.
2- the specular component of the shader... it doesnt matches the environment reflections well enough, either reduce it or keep playing with the directions of lightsjust with spec


robochish the secret is on the specular, and u gotta have something to reflect so that it isnt grey!...
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Edit me and my bigmouth you alrready did that on the latest pic... finetuning that is always a pain.... looks great!, not nailed but very close... congratulations...