Of course I use them Ratty. 21/2.8, 28/2, 35,2 , 50/2Makro, 100/2Makro, 135apo and 21/2.8Biogon, 35/2.8Biogon
On D700, F100, FM3a and M7
400TX(Arista Premium) / Provia 160/400/800
I dont scan the negs and my website pics only show my first 72days as a street photographer. I have other work but cannot show it yet, its for somewhere else and not on this foolish internet. All the pics on my site are Zeiss. Am upgrading the website soon, its in flash and needs a min to load and then is fast, music is optional (grin). My pics are not for peepers and I dont have any of those just as these guys dont have anything to show. The one that called the 100makro huge and heavy is odd, its 660grams (105 is 750grams) and the cosina expert is something my daddy would have smacked me for being, they have no idea and its so in-your-face-obvious.
The signature is of course distinct from any nikkor/nikon, nothing alike in colour or contrast but you already know this. The only lens that comes close (contrast) is the 35/1.4 ais but it was too nervous for close work in the street. The nikon 200mm has a similar colour but thats all and was beyond my promise (and my finances) to myself that 100mm was my limit for street but the 135/2apo was too hard to resist and my favourite zeiss.
On FM a blind test was done about 2years ago, was a complex test too and much work was put into it and we all picked the zeiss. Maybe go find that, someone there will likely have a link to it, I think there was even 100makro - 105nikon tests I think.
I honestly dont know where these guys come from ratty, there is no end to them and yet they all sound the same, one of them even sounds familiar to me from dpr. For your own understanding, go to FM and load the nikon pics thread and then go to alt and load the zeiss pic threads. Get a coffee, put some music on and it will not be long before you understand and with your own eyes. Watch each thread backwards from last post and you will even see that the canon/nikon mix makes no difference and of course with the same lens it shouldn't ...not for web pics.
What do I prefer the zeiss on ...Film or Digital?
Film absolutely, is my best work too.
Oh and just a quick edit, the voigtlanders are not zeiss either, had the 20 and the 40 and the 58, 40 is fun, 58 is the best of them but they are not substitutes and I like them less than the Nikons that at least give you AF.