I've mentioned my training partner Peter a few times and posted some pics. These are legit 16.5" calves, 17"+ pumped and in good condition. Get a picture of Bob's calves to compare. 21" seems a bit high, but 19" or so is probably not out of the question.
Oh yeah, and of course tons of pros lie. A few are probably being honest though. For example, Dexter is probably around Shawn's competitive weight of 210, but claims 230. Shawn was being honest though.