The 52 is a fine gun, however, has been eclipsed by more modern designs and most significantly, rule changes. I'm not sure if the GSP, Pardini HP, or MG4 are more precise but they're certainly more adjustable and thus offer more flexibility to the user. Being .32S&W they also offer less recoil, a lower bore axis, and better(more adjustable) sights.
I've heard that the twist rate in the S&W52 made the bullet unstable at 50yd, however never shot mine at that distance and can't back it up with personal experience. There's an in-depth discussion of the topic on Bullseye-L and targettalk for those interested.
Despite all of the above, I suspect the rule change to allow centrefire to be shot with .45 and the availability of switch - calibre guns was the demise of the S&W 52. It's easier to learn two guns, or even one for those shooting 1911 .22 conversions, than three separate firearms.
As for which centrefire pistols are more precise than my 52 was...I don't honestly know. I can tell you that I'm more accurate with my 1911, X5, & X6 than I was the 52. I shoot most of my rimfires better still.