Is the ZG47 really that superior to a DWM Argentino, FN System or a between-wars (say a 1937 or 1941 Portugal) Oberndorfer ?
No.
It starts to dawn on me that the ZG47 is nowadays far too hyped... As is the Z 21 Brno. I mean it still has that cheap CZ East block image and "flavor", doesn't it ?
The ZG may be overhyped but so are many of the "desirable" Mausers. The ZG may not be any better but quality of steel has been improving with time, so they are definitely no worse than any of the old Mausers.
And I really disagree about the Z 21 Brnos. They truly are the nicest Brnos produced and IMO the nicest small ring Mausers anywhere. Again, some may be overpriced but they are harder to find in good shape. And finally, "Cheap CZ East Block image?" LOL. Certainly not the Z 21.
... the biggest advantage that the ZG 47 has over the other Mauser actions mentioned by you is that they come with the bridges of the action already machined at the factory to accept mounts. This provides a very tidy solution to scope mounting.
Other than that, I am not convinced that the quality of the action is any better than the Obendorf, DWM, FN commercial, or even VZ 24 Brno actions made before and after WW2.
Well put. I have always thought the ZG was the "best" Mauser one could get. Strong, slick, integral scope mounts, low profile bolt handle, adjustable trigger, quiet and easy 2-position safety. So I got me some. And while I still like all those features, they do come at the usual detriment to simplicity of the original Mauser 2 stage trigger and the wing safety. On top of that I don't understand enough about sear engagement to tell whether the old school steep angle (close to 90 degrees?) is better than the angled ones like ZG or Remington (which I think require more force to hold and thus overcome), etc. Either way, for a new rifle build I would not hesitate to use a ZG over ZKK or CZ 550. Would I use one over a Mauser or Z 21? Don't think so unless I really wanted the integral dovetails and the low profile bolt handle without modifying a Mauser/Z 21 bolt.
As to some of the other things mentioned:
The ZKK peep sight is indeed a cool feature but I'm sure it could be retro fitted to a ZG or Z 21 with the square bridge.
And as to slickness in general:
I actually went and got a Win 70 SS and a Kimber 84L SS just to compare these to the beloved Mausers and Brnos and unfortunately I have to admit I find them even slicker than my CZ 550, Z 21 or the commercial Oberndorf 98 which happen to be the slickest I have had. I would definitely pick them over ZKK/CZ 550 also. Again some/many features not to my liking but these seem like more than decent alternatives especially if you want stainless "Mauser style" action.