The PPK is a proven design and has been around since at least the early
30's. It has a manual safety/decocking lever plus a firing pin safety. It
also has a "loaded chamber indicator". It can rightfully be called a "classic". You can't say the same about the Sig.
I've owned both. The Walther is definately a classic! Many of it's features are still revolutionary especially considering that it was invented in the '30's. Having said that I thought the P230/232 was a better modern firearm especially w/HP ammo. Both are excellent CC pieces and their construction is top notch!
I have no experience with Sig's, but have a 380 PPK. If you have large hands you don't want one. The slide will rub across the top of the hand between the thumb and index finger. If you are lucky it will only burn from friction, otherwise it will do some damage. I am unaware of "unrealiable function."
I've had the P230 & PPK. I don't have large hands and still got a good dose of slide burn from both guns, main reason I don't have them anymore. PPK is classic and has several nice features, I didn't like the decocking lever location. I thought then and still do that the P230 was a far superior gun in every aspect. I ran probably 2000+ rounds through both guns, no reliability problems with either. I recently shot the PK380 and did NOT like it at all. Very hard recoil and nearly impossible to get a controlled second shot. That is a definite "try before you buy" gun.
I had a PPK. It would never get through a clip without jamming. Ammo didn't matter, it just wouldn't feed more than 5 rounds in a row. I finally got rid of it after a lot of work trying to correct the problem. Now I have a Bersa Thunder which fires every time.
I have both. The Sigs are my preferred piece out of the two. What I had heard, is that there is a possibility that the Walther could fire if dropped hard enough. I've never tested that theory, nor have I looked at the mechanisms close enough to analyze if it would be possible. If anyone knows for sure, I'd love to know. The PPK/S is a great firearm for it's time. The Sigs appear to fit and function better. I don't get the same sensation of recoil with the Sigs as I do from the Walther. I must be lucky, since my Walthers appear to work as intended. Very few malfunctions, if any that I can recall, even with some fairly radical hollow point stuff.
Really like my PPK/S but of course it sports a nice set of custom Exhibition english walnut grips whick make it much more comfortable to shoot. No malfuntions with mine and one of the trimmest easy to carry pcs you could ever find. I think this is what made it such a hit in the first place. And it packs a decent punch if ever needed and is fairly accurate. Trigger is excellent something sorely lacking in many other so called premium pistols! Phil S.Stockmaker