1. http://www.db.pandawow.me?spell=86538/mail-specialization
2. The passive talent give us only ~0.5% agility. Proof on screens
3. Mail Specialization have to give 5% agility while wearing only mail armor.
4. 20.10.2015
5. x100
6. 8/10
While wearing full mail items my agility is 20 780
http://imgur.com/0XiQJ15
While wearing cloth head 18 513
http://imgur.com/NyshpVF
My head total give me 2 159
20780-18513=2267
2267-2159=108
108 is my bonus form Mail specialization, 108 agi isn't 5% form 20780 ;D
UPDATE 21.10.2015
Thanks guys from more info from ur side. This is true, it's not 0.5% but also not 5%
Base agility = 235
Total agility from my items = 19 721
My current agility from stats = 20 780
Passive bonus = +5%
19 721 + 235 = 19 956
5% of 19 956 = 998 (round)
19 956 + 998 = 20 954 (more then i have)
20 780 - 19 956 = 824
824 of 19 956 = 3.96%
Like a say Furmetal, the difference gets higher and higher the more agility you get.