LOL, nice one
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I find that F4 does have some nicely detailed textures. To say one looks more realistic than the other is hard to tell anyway when you zoom by at high speeds (and can only be determined by an objective comparison, not personal preference). Both games also have their own reflection/specular map problems.
In GT5, the dynamic weather tracks do not become reflective when it starts to pour, but the rest of the effects are there (individual rain drops hitting windshield/road, splash). The tracks that are wet only (SSR7) have the proper reflections from the get go.
In F4, the road's specular map can lead to overblown glare and cause an overly smooth track. Going back to Wazzim's screenshot last page, you can see how there are inconsistencies in this regard.