Great looking buck!
And no, deer don't add that many inches between 3.5 and 4.5 usually.... but the 'wow' factor is almost universal between 3.5 and 4.5. What I mean by that is a typical 120" 3.5 y/o 8 with 3.75" bases and decent tine length seems tiny in comparison to the same buck a year later that would typically only score 130-135" buck have 50% more apparant mass. Only 15" of extra antler, but the rack appears to be twice as large.