I think the most recent WLF have a diopter that can be switched out (has a bar type release to open as opposed to the earlier button release to open finder. also has a round magnifier glass, earlier has square glass)

The stock screens in the older cameras really do bite a big one. (have a crosshair kinda pattern on it)
Thats why they started the Accute Matte and then the AccuteMatteD.

I could get nowhere with my original crosshair style and eventually got a maxwell with focussing aid.
IMO ANY screen will be better than one of those original hasselblad screens. Even a 10.00 (china or former eastern bloc made, I forget) eBay screen with split microprism.