the cv 35 is a great and small lens it is true but it's part of the cv r4a kit.
the new zm would be part of the zeiss kit. i like to change things around at times, the 35/2 zm is a fabulous lens and i have nothing but high praise for it. if the zm 35/2.8 is as good i would be very happy and maybe it's better but for sure it's different.
analyzing, being logical rarely enters into these decisions for me...that's for work and matters of import.
as to the money part of things i usually lose a few bucks but someone else usually gets a pretty good deal on my older but pristine gear and that's a good thing.
i don't drink, smoke or do drugs and since the heart attack i gave up my cigars to boot so what else should i spend my money on?
life is too short to worry about the hobbies of life.
joe