Graphics? thats about the ONLY thing GT5 excells over Forza. The gap is small actually, especially with forza 4.
but overall, if release frequency and scores are anything to go by.....GT has clearly been knocked out of being the best of what it does
Dissecting the actual words of reviewers, they don't seem to agree.
And despite it's 84 Meta score, most in the industry would tell you that Forza isn't on GT's level (the same way Resistance nor Killzone are on Halo's level).