Upload & Sell: Off
And here is the definite list on which lens has the best price per area although I used the diagonal angular field. I used a swedish site for the price info and then normalized the values so that the 35/1.4 Distagon had a value price/angular field of 100. Although the 15/2.8 value isn't that low it should be said it is by far the most expensive Zeiss ZE lens here in Sweden at least. So enjoy
15/2.8 Distagon 94
18/3.5 Distagon 50
21/2.8 Distagon 70
25/2 Distagon 70
28/2 Distagon 64
35/1.4 Distagon 100
35/2 Distagon 58
50/1.4 Planar 55
50/2 M-Planar 100
85/1.4 Planar 155
100/2 M-Planar 266
135/2 Sonnar 385
Now combination of this analysis with Bob's argument makes perfect sense. I can hear my conversation with the wife already:
"Honey, you know how much you like my photos with my 35/1.4? Well, it turns out that the 50/2 has the same cost ratio, and you liked my mountain shots with the one that I rented, so I should indeed buy that one. Quite close to the same ratio turns out to be a new Zeiss 15mm lens. Don't worry about its actual dollar price tag so much as think of it as the same as the 35/1.4."
"What lenses will you sell to finance those?"
"Wow, I am glad that you asked. It turns out that all of those tele lenses that I have simply have a ratio skewed against them in today's market, so it would actually not be cost effective to sell them. It would be like short selling stock, and we wouldn't do that."
"Why not buy some of the lenses with even lower cost ratio?"
"Honey, I really like the way that you think. We could do that NEXT."
Fairly certain that a divorce lawyer would be on retainer within the hour.