I have heard that some like the ccd tonality more, some the cmos.
Actually, tonality is a lot more complicated than just sensor type and actually fairly loosely coupled.
Like the H&D curve of old, camera manufacturers assign conversion curves for each sensor (and for each color if there be color), so being at the risk of being pummeled about the head and shoulders with a wet trout, the best tonality is the one YOU like best subject, of course, to whatever adjustments YOU make.
On the subject of sensor replacement pricing, remember that as tech gets older, it becomes no longer manufactured generally at some point in time. This forces those who support stuff like cameras and old tube radios
to do what is known as an end-of life purchase from the manufacturer for the remaining lifetime of the stuff that is being maintained.
That inventory is expensive, and further, a smart manufacturer will price that inventory to manage its depletion based on statistics that it alone is capable of producing. When the shelves go bare on the older stuff, it is the end of the road.
I am encouraged to see that there are still parts available at any price, and at SOME point, prices will get to the point where replacement of the equipment will be the best economic choice for the consumer.
Anyway, my two bits on the kerfuffle.
thanks
-bob