Ive owned them both and those that says one is 80% the same as the other has no idea what they are talking about. Yes, they do look somewhat similar on the exterior and interior (save for leather types etc.....which is a big difference BTW). However, that is where any similarity ends. The power delivery, driving dynamics, steering feel, suspension, engine sound, et al are not even close to being the same.
Having said that, they are both fantastic cars. Just buy the one that suits you and anyone else's opinion shouldn't matter.