I have two, a S&W PPKs and an Interarms PPK. fit and finish are comparable in my opinion, and even with the extended tang on the S&W it did tend to leave bloody red streaks on my shooting hand until I doctored the bottom rear edges of the slide using gentle persuasion on my gray wheel. I have to wonder how bad it would have been without the extended tang!
My Interarms PPK is a safe queen so I haven't shot it, and besides I like the PPKs better because it has regular grip panels.
The guns need to be carried and shot a lot to personalize the manual of arms if you are used to other types of autos which have safeties, as they can be carried like a snub nosed revolver, hammer down, loaded chamber, pull it out, aim squeeze and fire.
But if at times you carry a single action only pistol with safety that's a different drill. Nothing wrong with that but it would possibly be confusing during that first 1/2 second of an unexpected firefight if one carried one type 3 days a week and the other 4 days a week.
The appearance of these guns is similar to many others including the HSC, several Spanish pistols (Astra Constable) and German pistols seldom ever seen but which look similar (Sauer & Sons M38) and eastern satellite state P64 and P63.
There is a lot of differences to nit pick at if one wishes, like some with heel mag releases (Why?), some chambered for cartridges arguably better but somewhat rare, aluminum frames I wouldn't give a nickle for, and the Sig 230 and 232.
I'm very glad Walther started up the Fort Smith factory because that means this design will be around for a long time. The fact that they didn't bother to dovetail the rear sight kept me from buying one though.