I'm not sure if I have AS or not but I think I can gauge other guys' attractiveness pretty well. In fact, in some cases I seem to indulge in awe - being straight means it's like watching the design of a new car; I simply don't get to the point where I'm attracted.
I only do not go out of my way to voice my opinion because of dumb social pressure. Once an online pal I've known for years wanted to say I should be confident with girls because I'm fairly good looking and he beat around the bush and clarified that he was straight like three times - which kind of made me chuckle.
I get mixed feelings about guys being better looking than I because it's like the IQ thing; I rank high, sometimes the highest, but somebody noticeably better will eventually come along and I'm just not used to it. It destroys a feeling of superiority I normally enjoy and at the same time my anti-envy conscience kicks in and begins to monitor each thought and action of mine.
It's more of a problem with looks as some good looking people have a higher chance, I think, of having a completely different mindset than my own and being able to pose a real threat in the form, say, of harassment - there may not be time for anti-envy introspective hair-splitting. Also any difference in attitude towards good looking people of the same sex - basically being more awkward around them due to the whole psychological/philosophical accomodating I seem to need to do - might be dangerously misinterpreted.
That said, I do not consider better looking people to necessarily have to be my rivals. In practice, couples show to have the oddest combinations of attractiveness. Also, my problem usually is with group/clique leaders, psychopaths and other manipulator of the social environment which cause inept people to get good jobs and pressure for nice girls to stick to guys worthless in every sense (usually themselves-and-a-buddy, etc. . .). People who can beat me in honest face-value ways I have no qualms with; it'd just mean I'd have to settle with second or third best - which is, as theory, much better than my general real life situation.