Carwash, go to trainers.hitechcreations.com, and partway down the menu there will be printable speed and climb charts that are all scaled the same. I printed them all, then I printed "my ride's" on a transparency, 3 Hole punched the whole lot of them, and it's real easy to compare my planes to any others.
To go one better, there is a link to DocGonzo's aircraft comparisons, where you can compare and chart the aircraft wonderfully. (Caveat, I myself don't know how current the data might be, but they "seem" to be representative of the aircrafts current modeling).