About the size of a G19, but way heavier. Holds 12 rounds vs. 15 of the G19, and 9x18 doesn't exactly compare to 9mm luger ballistically.
But a lot of people will shoot a cz-82 better than a G19. The grip just feels better to me, and the trigger is much nicer than any glock.
If you can shoot a glock well, honestly, the g19 is a better carry gun. However, if you're on a tight budget, or if you prefer all steel guns, or if you prefer guns with a hammer, or if you prefer DA/SA guns, or if you're a big trigger snob, the cz-82 may perhaps be a better choice for you than a g19.