89 degree left/right Does means 178 degree full axis even though it states 178 degree both IPS and VA panel does have color degradation if you see it from the sides unlike plasma TV's. VA Panels has more degradation but excellent black levels when viewed from the center ,while IPS Panels has less degradation but have to compromise a bit on its black levels.
Then why would Sony list 89 degree in some model and 178 degree in other model.
See these
178 (Right/Left), 178 (Up/Down)
here KDL-32W600A : W600A Series : BRAVIA HD TV (LED & LCD) : Sony India
89 (Right/Left), 89 (Up/Down)
here KDL-42W700B : W700B Series : BRAVIA HD TV (LED & LCD) : Sony India
All 'A' series ones have 178 degree while 'B' series ones have 89 degree.
Something which everyone should consider if they are buying for big living room or big family