For the PTR there is only one server. For other servers, I can look at the current numbers, but I did that a couple months ago. Let me find that post and I’ll update here.
Also, you can check out the current top 20 era wizards here.
http://www.diablo3ladder.com/index.php?action=grift&action2=era&realm=0&class=wizard&server=all&group=1
Data from August 4, where I looked at the top 40 solo clears worldwide.