I'm thinking of consolidating my 85 1.8 and 135L into the 100MP, but I feel I would miss them (mainly the 135L). I guess I'll just wait for a while until I can afford the 100MP outright.
Don't wait, just sell them both. I used to live 35mm and 85mm around the middle, but never, ever loved the 135 focal length. If it works for you, great. The final straw for me was an event I shot for a friend that was dim as dim could be. I was forced to manual focus, which is fine. But the 85 seemed too distant (and nothing I couldn't have gotten without 2 steps forward with a 50), and the 135 was too long. I sold them both and find the 100 much more usable. And I get to add a macro to my bag.
The Zeiss 21, 35 and 100 are the undisputed champs of the ZE line. Luckily for some they're fairly evenly spaced in angle-of-coverage. I use to live 35mm FL, but now it bores me -- just not enough change of persepective -- kinda like a 50mm 2 steps back. So I'm priming at 21, 28, 50 (now ZE, soon 1.2L UY) and 100. Even the Canon 70-200 2.8II is a huge letdown after Zeiss primes.