I too have had experience with all three guns….I have shot in competition for 50 years and have mixed feelings….all except one (1). The 945 is the gun I would call my favorite 'of all time".
It all started with a 745 that I inherited from a son-in-law who divorced my daughter….I hated the gun, since, at the time, all I could compare it to was a modified Gold Cup. I was top gun in a local league and the Gold Cup was best gun I had shot.
I hurt my arm and decided to shoot with reduced recoil….bought a Model 52. Much to my surprise, it was not very accurate…..
I sent it back to S&W and it was given to one of the pistol smiths from the (new) Performance Center who I had met at an armory class at S&W. He explained that some 52s (it was a -2) had bad barrels, and he replaced the barrel with one from the retired shooting team guns. It became a tack driver….except that I had jamming problems (both reloads and commercial) that occasionally reared their ugly head.
I then found a 845 and liked it, but it did not shoot as accurately as the Gold Cup…..so I sold it. Back to the smaller caliber….bought a 952 and it changed my world….incredible gun. Soft shooting and accurate. My dealer got a NEW 945 (serial#91) and I fell in love with the LOOKS. Once I shot it, my world changed once again. It was more accurate than the Gold Cup and a dream to clean. I still shoot it, and it will shoot sub 2"groups @ 50yds from a rest. In fact, I later bought a 1.5" Les Baer Bullseye gun to help a friend (who needed money) and the 945 outshot the Baer….
I had a set of .356TSW guns, and I converted the 5" to 9mm at the Performance Center. I compared to the 952, and the 5" converted .356 was even more accurate (Briley bushing…basically the same gun only double stacker).
The 945 is the King. It outshoots some really nice custom guns I have built. I have not compared it to the newer PC 1911's…
For Matches, I shoot a .22 Pardini, a .32 Pardinin and my 945.