I was referring to system lenses with full comparability without adapters.
If we were to add all the 3rd party lenses and lenses with adapters the Nikon would have more options again.
Also add to that the fact that you can use live view with the Nikon for accuracy when using older manual lenses.
In comparison using a Hasselblad 110mm f2 on my Phasee One DF was almost unusable wide open due to the limited magnification of the Df viewfinder and lack of waist level or loup finder. The DF focus confirmation with the 110mm f2 was far from accurate unlike the focus confirmation on both my Canons and Nikon
The Hasselblad H to CF/CFi/CFE adapter is hellishly expensive and not the most reliable gadget out there.
Regarding high speed sync. True you get full power from a studio strobe at higher sync speeds with leaf shutters, but there are workarounds with high speed sync with Nikon and Canon cameras.
You can use multiple Speedlights in high speed sync with Canon and Nikon to increase power.
I use pocket wizard Flex TTL radio triggers with two Elinchrom AS3000 packs into a dual head and get all the power I need. The power loss using high speed focal plane sync is no problem when starting out with 6,000 w/s. When used with the brilliant SL35 Elinchrom fresnel spot I get around f22 at 1/2000 at 15 feet.
Large studio strobe packs can be found at great prices on ebay. Way less than the investment needed in LS lenses.
Another thing to consider is that if you are using flash to overpower the sun you can also use a 3.5 stop neutral density filter and more strobe power to obtain exactly what you get with the best of leaf shutters, but with the advantage of investing in flash rather than the same amount for each lens. The Nikon or Canon workarounds also work from fisheye to tele.