No V4 isn't exactly symmetrical.  The best way to discover where it is off is to load V4/M4 and look at the size and the location of each individual body part.  It's not a lot, but you'll see it if you are using a 50x or 100x magnification.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)