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looks a hell of a lot more like a missed draw (and there are a lot of potential ones on this board) than a very strong hand. Hard to put a % on it, but I'd guess like 60% missed draw, 40% he has you beat. Definitely a call though in my opinion.

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Lets see what "draws" he "should" have ...

45- would he call this utg + 1? Not likley.
A4/A5- would he call a big raise on the flop and a 550 bet on the turn? Not likley.
Diamond Draw- would he call on the flop with just a backdoor flush draw? I dont see this, unless its something like A [img]/images/graemlins/diamond.gif[/img] 3 [img]/images/graemlins/diamond.gif[/img], even then ... Not Likley.
Club Draw- This seems like it could be played as a club draw. Much more possible than the former 3. However, most players wont push this spot on a missed draw. Somewhat Likley.

Much more probable that you are facing a set, two pair, a higher T, or something else that beats you.