how good is the canon markII Think to switch from nikon reason are

I want to have a full frame camera lm scared to buy the d6oo because of oil leak and the d800 dont need that pix size so lm leading to mark II ..I not sure if the differnt in price is worth it since lm not a pro ....I use to like to shot sport and nature but doing wedding and portriat now any advie would be help full .. have a xmas

Buddy

--
http://gbbigshots.zenfolio.com