V3 came with a good number of specific muscle morph right from the start and had a really good bicep flex morph.  V4 came with less specific muscle morphs than V3, and the bicep morph that came with V4 is pitiful compared with V3's.  Both figures have the bodybuilder type morph set to 1.0 and the bicep flex morph set to 1.0.  While V4 has much potential for realistic muscle than V3, DAZ is off to a poor start when it comes to muscle morphs.  Muscle morphs is in the "more to come" category.

Rob W. posted "There coming" as a response in a DAZ forum topic about V4's muscle morphs.  The post was made on 12/9, and there is no word a month later. But from what I've read on the forums, there is not much interest in accurate muscle morphs anyway.  Guess that puts me in the minority, since I prefer to create muscular female characters.  V4 is pretty useless to me without the more specific muscle morphs.