The 80mm f2.8 that was launched with the original Hasselblad 500C in 1957 was a six element design, which was updated to the current seven element design in the early 1960's, I think it was in 1961 but I might be a year or two out. The optical configuration has remained unchanged ever since, although there's been the coating and non-optical improvements detailed previously.
The current Hassie 150mm f4.0 has an even longer history, it was released right alongside the 500C in 1957 and is unchanged optically to the present day. And the current Hassie 250mm f5.6 goes back still further, its optical configuration dates from the Hasselblad 1000F of 1954 (even though it was then in a completely different barrel and was for a focal plane shutter camera). So here's a lens from the very top performance drawer, that you can buy today, and that will celebrate its 50th birthday this year! The Zeiss 38mm Biogon is also of a similar vintage.
Can you imagine just how outstanding these lenses must have seemed when they were fresh to the market? The only thing that came even close in Medium Format was the Rollieflex optics, the most prestigious of which were also from Zeiss.
By the way, please don't think I'm a complete camera nerd, I just happen to collect photographica from 1957 (the year I was born), so this falls into that area of interest!