I would have to ask myself several questions;

How are the genetics in my area?
What else have I been seeing so far this season?
How many days do I have left to hunt this season?
If I pass on him now, what are the chances that he'll get shot by another hunter?
How old does he look?
Will his rack continue to grow after this year, or is he old enough that his rack will now start to shrink?

Now, if there were excellent genetics in your area, you'd been seeing a good number of bucks so far this season, and you had a dozen or more days left to hunt, I would pass on him.