C *T lens is just fine. The only difference in the CF is the type of shutter used. The lens is the same design, with the same coatings
A C T* lens is indeed fine.
But the difference between it and a CF lens are more than the shutter.
The C lens has an all metal barrel, with a knurled ridge that serves as focussing ring.
The CF lens has a rubber grip surface, like most lenses.
The C lens has shutterspeed and aperture rings coupled by default.
There is a tab which you need to push towards the rear of the lens to disengage the two and be able to set shutterspeeds independently.
When you do, you must set the desired shutterspeed against the aperture you want to use, then release the interlock release, and move both until the combination is opposite the mark (i.e. set).
It can happen that the two rings are set such that you can't move the desired shutterspeed against the aperture you want, and you then have to set a different combination first, lock the two rings together again and move both, push that tab again and have another go.
On the CF lens, both rings move independently by default, and you can set either separately.
You can still lock the two to move as one (keeping the set EV value constant( if you so wish by pushing a little button.
The C lens has a little tab that when pushed closes the diaphragm to the aperture selected (DOF preview).
It then stays closed, unless you move the aperture ring to the maximum aperture (which may not be possible in one go), after which you need to set the right aperture and shutterspeed again.
The CF has a sliding tab, that when pushed down closes the diaphragm, and when allowed to pop up again opens the thingy again.
The C lens has a flash synch-mode setting tab too, allowing you to set either X (electronic flash) or M for medium speed flash bulbs.
The same tab also sets a self timer.
The CF lens only offers X-synch, and no self timer.
The C lens has two pointers that move when you change aperture setting, indicating the near and far limits of the depth of field on the distance scale.
The CF lens has the DOF markings commonly found on lenses.
C lenses (most of them anyway, including the 80 mm lens) have a bayonet 50 filter and hood mount. The CF lenses have (in majority) a larger bayonet 60 mount.
So more than just the shutter. Not all improvements (though most of the things that make a CF lens are), but quite a few differences.
The shutter is different too, as was mentioned.
The C lenses use Synchro Compur shutters made by Deckel. Deckel closed shop, and a new shutter had to be found. Another Zeiss Foundation company, Alfred Gauthier, produced a Prontor shutter.
The Prontor differs from the Synchro Compur in that it does not have the selftimer and flash synch choice.
But also in that the Prontor has a feature that Hasselblad came up with: a setting that switches the shutter off ("F mode"), leaving only the diaphragm to work.
It helps when a CF lens is used on a focal plane shutter camera with instant mirror return. A C lens' shutter remains closed until the camera is wound, so despite instant return mirror in those cameras, there is no viewfinder image. Woth the shutter in the CF lens switched off, there of course is.