QUOTE(Tony Stark @ Feb 16 2013, 01:47 AM)
im replying to my earlier post myself due to nobody replied

anyways, tried and tried it again n again, it seems that the middle AF is giving me quite accurate results. atleast 8/10 in focus which is good enough imo.
but i found the culprit behind this - the AF assist light that comes from my speedlight(s) (im using the SB700 and SB910 for the tests), once i turned off the AF assist light from the flashgun, things seems to be in good focus. im quite happy about this.
so..any of u is going thru this also? does this means my speedlights' AF assist light arent accurate? (note that i use 2 different speedlights and it gives me almost the same out of focus results, i had to put the AF fine tune on -20 when im using speedlight+AF assist from the speedlight, once AF assist is off, no fine tune is needed to nail a shot - using the 50mm 1.8G @ f2)
any thoughts is appreciated!

Hahha Tony! Sorry!! Busy la with CNY and house visiting and other activities

Uhmm I normally shoot with AF-C 3d tracking so theres no AF light from my SB910..
Uhmm Actually I do even miss focus from my 16-35 F4! Deng!
The only primes I have is a zeiss 35mm 1.4 which is manual focus so I couldn't really comment on that and the 50mm 1.8 rarely use it unless i go traveling
I still haven't sent my D800 for check up! Died half way while shooting in the rain in December 2012! Scared the hell out of me! LOL Manage to revive it back after 5 days!