That's not the easiest question to answer. The difference from one model to the next, or from a more basic tier of one model to the next higher, is never a matter of quality--it's defined by features, materials, detailing, and additional milling.
I've not handled a Gen 1 serial production Quantum, but I imagine the difference between that knife and the Ursus is similar to that between an F95R and the original F95NL. I own one of the former and had the NL World Tour knife to play with for three weeks back in 2019. The F95NL had a more basic, unadorned feel to it with SRBS instead of MRBS, no internal milling, and a "lesser" steel in Elmax as opposed to the Vanax 37 of my F95R.
That said, aside from possible lateral strength issues, the main difference between the two pivot systems is that SRBS tends to be snappier and freer than MRBS, which is certainly smoother. I like them both for what they are. My older F95 Turtle was the standard serial production version before the R series and the introduction of the more basic tier, is SRBS, without internal milling, but is M390, and I like it no less than my aforementioned F95R. It's in no way of lesser quality, just a bit less "advanced".
Anyway, the Ursus does have a bit of a more basic feel to it than say my Gen 2 111, the F95R, certainly my RDD, and even my older Turtle and SRBS F3 Python. It's not dissimilar in feel to my NeOn UL (open back, S30V) and, again the F95NL that I had the use of for a few weeks. Still, it has that Shiro quality which is not duplicated much elsewhere and gives you a knife from the SBW that prices in the same ballpark as an inlayed CRK.
I've had some recent discussion with
Chuck_Nunface
--who has a G10 F3 and now the Merlot F95NL--about our growing admiration, possibly even a preference, for these more basic Shiro models as they're excellent working knives at about half the cost of the upper tier of the same serial production models. I really like my Quantum Ursus NL, am super glad I pulled the trigger on it, and am having trouble putting it down.
And since it didn't happen without pics...
Rufus1949 , shipping direct to US customers from Russia has been pretty slow. It's generally taken the better part of a week for my Russian Post packages from Pavlovo (Cheburkov and Biryukov) to mosey along to clear Customs just north of Moscow in Khimki and then even EMS can sit in a black hole at Sheremetyevo Airport for 2-3 weeks. For your sake, I certainly hope things have changed for the better and your time estimate plays out as you expect.
