Sorry, Johnny L.A., I didn’t realise we’d completely managed to miss your original question… :smack:
I’ve done a web search and gone through my own reference library, and have come up with absolutely nothing wrt to Japanese use or evaluation of the M1911 in WWII. There’s plenty of references to Japanese officers/NCOs/aircrews using captured Browning/Colt M1903s and other similar .32ACP calibre small-frame handguns, but nothing about M1911s, Lugers (the Dutch East Indies military were equipped with Lugers), S&W Victory revolvers, Webley/Enfield revolvers, Browning Hi-Powers (I don’t think these ever saw service in the Pacific Theatre, though) etc.
I have seen pictures of Japanese troops in Manchuria with Mauser C96 Broomhandles, which were in 7.63x25 Mauser, and from that I’m going to assume that the Japanese simply preferred the 7.62 and 7.65mm handgun cartridges to the larger centrefire handgun cartridges used by the Allies.
Also bear in mind that the Allies had a very low opinion of Japanese firearms- Arisakas were widely regarded as being complete shit, which is certainly true of the Type 99 rifles made after the end of 1942 or so, but the 6.5mm Ariska calibre Type 38 rifles were just as good as anything the Europeans were fielding, quality wise. The Type 94 Nambu is frequently regarded (and with good reason) as Worst. Service Pistol. Ever with, the Type 26 revolver a close second - but there was nothing wrong with the Nambu Type 1 and 14 handguns except the underpowered cartridge.
No doubt the Japanese had similar views of European weapons being “Inferior” to the Emperor’s weapons (Remember, all the equipment in the Japanese Army was the property of the Emperor, who was the greatest and most awesome person in the universe as far as the Japanese were concerned), and while Japanese officers were known to have Western handguns, they appear to be exclusively 7.62 or 7.65mm handguns like the Colt/Browning M1903. I can’t even begin to imagine where they’d get .32ACP ammunition in Burma or New Guinea, though.
And that point is, I think, related to the Japanese lack of interest in the larger European handguns- where would you get ammo? Sure, you might capture some from time to time, but I’m going to make an educated guess here and say that the Japanese probably saw the .45ACP Colt M1911A1 as being very much like WWII equivalent of the modern-day .50AE Desert Eagle- ie, big, heavy, awkward to use (for them), and stupidly overpowered for general use.
The Japanese did employ captured SMLE rifles because they already had ammunition for them (remember, some of their MG ammo was interchangeable with the .303 British cartridge the SMLE used), and the Indian National Army who fought with the Japanese used British weapons (including S&W, Webley, and Enfield revolvers, along with SMLE rifles, Vickers-Berthier MGs, and so on), but for the most part the Japanese didn’t seem especially interested in employing anyone’s weapons except their own (Which carried the Emperor’s Seal Of Quality*, remember).
Incidentally, The Germans had a very low opinion of the Nagant M1895, which they called the “Ivan Revolver”. There’s nothing wrong with the gun at all- they’re very well made, accurate, and reliable, but the 7.62x38R cartridge has very little stopping power (IME they’re not greatly more effective than a .22LR at knocking over bowling pins at 10m). The 7.62x25 Tokarev is a more effective cartridge (ballistically similar to 7.63x25 Mauser- the Tokarev cartridge was developed from the Mauser one) and the Germans found they could rechamber captured 7.62x25 Tokarev guns to 9mm Parabellum, enabling them to use their own pistol and SMG ammo in them. And the double-action trigger pull on the Nagant M1895 ranges from “A bit on the heavy side” to “very difficult”, which is why they were generally used in single-action mode for the most part. (Pre-Russian Revolution models were made in two types: Single-Action for NCOs and enlisted men, and Double-Action for officers.)
*In the form of a Chrysanthemum, stamped on all Japanese military firearms to denote they were the Emperor’s property. After the War, these were generally ground off before the guns were surrendered to the Allies, as it was dishonourable to surrender something which belonged to the Emperor.