I think his K/BB ratio speaks louder than anything. 8.25!?! It would be very hard to luck into absolutely pounding the strikezone and while striking everyone out.
237 IP, 32 BB, 264 K... Yikes!
Even if he cuts his K/BB more than in half, say 200/50, that's still awesome. It's good to see his periphials came along for the ride, like WHIP as well. Sheets' 2004 seems to stem more from actual improvement than an unusually high number of balls put into play being converted into outs (COUGHpavanoCOUGH).