I have four 629-6s. Two PCs, two standard production. Two were ordered before I knew better to inspect for barrel cant. Of those two, the PC was a comp hunter, shoots great, good fit and finish, EXCEPT for the barrel cant. Keep in mind the comp hunter has the removable scope mount on the barrel. Set up the scope using levels, which really accentuated the effects of barrel cant. To hold the crosshairs level, had to cant the firearm. If both were aligned, the vertical crosshair should run center of frame. Shorter barrels are really impacted because of the shorter sight radius. Never had this issue with all the -5s I own.
Like any revolver, check timing and lock up. I'm not too worried if they are a bit gritty. Most new from the factory are bone dry and it's pretty easy to smooth out a smith.