Upload & Sell: Off
Curtis... very very well said. I think you hit the nail on the head with your first post here. I've enjoyed a lot of older Nikon MF glass, including a 28, a 35, several 50's, a 105, a 135 and a 200, and while they were fun to play with and a pittance of a cost to have that fun, shortly after I "discovered" my first Zeiss lenses, and ended up (1) buying 3 of them (35/50/100) and (2) selling off all my MF Nikkors.
My reasoning for selling the Nikkors was pretty simple... after buying the 3 Zeiss lenses I realized I was really not going to be spending time with the MF Nikkors anymore. Any MF time I wanted to spend was going to be dedicated to the more expensive ZF's. What are they better at? Well, build is a no-brainer. The Nikkors felt sloppy in comparison. They should for the difference in cost. My ZF100/f2 cost more than what I paid for all 7 of the Nikkors I owned at the time. They also had far superior coatings, making them more versatile in tougher conditions. (Although let me say some people use this "disadvantage" to their "advantage" and make some incredibly imaginative and effective images shooting MF Nikkors in those conditions... just check out the MF Nikkor thread to see what I mean...)
HOWEVER... for someone starting out in MF lenses, I honestly think you'd be crazy to just go out and invest heavily in Zeiss glass, when you can get a couple Nikkor MF's to experiment with for a tiny cost, and then if MF isn't for you, sell them for what you paid for them. Try to enjoy that with Zeiss glass... ain't gonna happen.
Let me also say that some Nikkors are absolute stunning optics, and others are, well, not. Curtis would be a great reference. For me, the 105/f2.5 was phenominal until mine got a fungus issue. The 50mm/f2 and 28/f3.5 were also excellent for sharpness. And part of the fun is trying to find those hidden gems on the market, often for $50 to $100 in good condition!!