To be honest Paladins are the most open vocation at Tibia, but what you are saiyng take us to the past. When Tibia was created we use to have 4 vocation extremely defined and totally different amog them but alog of the years it was changing and vocations became more balanced and similar to each one. Today Sorcerers and Druids are basically the same thing with the exception of "sio" and "gran mas res", same to EK and RP which basically the only important difference is the spell "Challenge".
I do not trust Paladins at Tibia are so different from others MMO's think the main difference you can find more vocations to choose at other games so they can make it more specific.