Outside of the 40 & 50mm FLE redesigns (there's a couple of others that could have done with a revision too, at least from my experience with negs/ transparencies from them) & a handful of other revisions done for either budget options or environmental necessity (in neither instance necessarily prioritising central performance over across the field performance) - Zeiss does not appear to have fundamentally updated (and it will have largely been on Hasselblad's asking, not their own volition) many of the lenses that they first drew up from the late 1950s onwards - and while manufacturing tolerances got tighter, T* coating came online and some small glass changes will have occurred, even a brief look at their own MTF's shows that the differences were often remarkably small - small enough that under a controlled test using real world imagery, most people would struggle to tell the difference - which is a different thing from the fan service some marketing departments like to indulge in.
You are right about the budget options like CB series, but it affected just 3 lenses (60, 80 and 160). I am still convinced that Zeiss was constantly developing and improving its lenses, and did not stop in late 60's as you suggest.
As it stands, Zeiss got things sufficiently right from day 1, and some others took 20-30 years to really catch up (Mamiya for example). It doesn't mean that the Zeiss lenses are the 'best' under any sort of pseudotechnical test, and that a lot of the more attractive aspects of their rendering relates to the high MTF at low frequencies, but not overbearingly so (unlike some modern MTF designed lenses from the 90s onwards). It's also worth noting that the one of the last completely new lenses for the Hasselblad V system was a Fuji made zoom - on the cusp of the Fuji/ Hasselblad collaboration for the H-series/ GX645.
Here is the list of the lenses which were designed/improved for Hasselblad after 1972:
F-Distagon 24/3.5 IHI
Distagon 40 FLE
Distagon 40 IF
Distagon 50/2.8 FLE (two optical designs)
Planar 110/2
Sonnar 150/2.8
Tele-Tessar 250/4
Tele-Tessar 350/4
Superachromat 300/2.8 FLE
Superachromat 350/5.6 FLE
Tele-Apotessar 500/8
Makro Planar 120 was further developed resulting in apochromatic version with the FLE for Contax 645.
I suggest that the zoom lenses did not align with Zeiss's philosophy of providing high-quality lenses ("prime lenses are always better than zoom lenses"). That's why both zoom lenses were produced by other companies: The 60-120 was produced by Fujifilm, and the 140-280 was produced by Schneider Kreuznach.
What I was referring to with Pentax and Zeiss was an abortive collaboration from the early 1970s (before Zeiss went with Yashica) that produced the 15mm f3.5 for 35mm and some other prototypes. I imagine that neither Hasselblad or Rollei were pleased about what the implications would mean for medium format & made their displeasure very clear to the powers that mattered at Zeiss. Pentax were apparently the company who Zeiss seemed to respect the most as a competitor at that time - and real-world, the classic P67 glass can hold up to the equivalent era Hasselblad lenses remarkably well (or best them, in the view of some who used both systems side-by-side on commercial work with decent budgets - and it wasn't to do with the P67's greater image area).
I heard from a German professional photographer that in the 1980s and 1990s, the main competitor of Hasselblad was the Mamiya 67. The resolution of Mamiya lenses was close to Hasselblad, but the 6x7 format had more potential comparing with the 6x4.5 crop of Hasselblad images.
Couple years ago I have seen side-to-side comparison of Pentax 55mm shift with Mamiya ULD 50mm on medium format sensor. Pentax lens was generally not as good as ULD 50: it was not as sharp and had a bunch of chromatic aberrations.
And while the 100 Planar and 250 Superachromat may have been exceptional in their day, they weren't the lenses most Hasselblad users were buying.
Regardless of this, these lenses (together with the Distagon 40 IF) are considered to be the sharpest in the Hasselblad system.