Hello, I am looking for some advice on choosing a telephoto lens, I am quite confused.
Recently I made the "mistake" of using Zeiss lenses :-O and have been really impressed by their optical quality, really really pleasing. Even though they are MF, I am getting satisfying results. Now I am looking for a telephoto lens, at least 300mm or more of focal lenght, for wildlife and landscape photography. I would use it on Canon 6d, 7d and sony a7.
Among the many options I ended up with this pool of candidates:
Leica 280 f2.8 Apo (the older, non modular version) + adapter
Canon 300mm f4
Canon 400mm f5.6
Canon 300mm f2.8 (the non IS version)
Canon 100-400mm
Now, the Leica 280mm f2.8 Apo si quite big and heavy, the same can be said for the Canon 300mm 2.8. What about the Leica's optical performance? I did not find many info about. The Leica would be my first choice, more or less for the Apo designation and for the "name=quality" reason.
My budget is about 1500-2000 dollars, if it was more I was going directly with the Canon 300mm 2.8 IS or the Leica 280mm f4 Apo. I have used already the Canon 400mm 5.6 and found it nice but not astonishing, definitely not in the same league as Zeiss lenses. Its major advantages are probably its small size and weight.
What I am looking for is the best optical qualities (bokeh, apo correction, color fidelity, etc.), not the best AF or IS stuff.
Thanks for you opinion!

Recently I made the "mistake" of using Zeiss lenses :-O and have been really impressed by their optical quality, really really pleasing. Even though they are MF, I am getting satisfying results. Now I am looking for a telephoto lens, at least 300mm or more of focal lenght, for wildlife and landscape photography. I would use it on Canon 6d, 7d and sony a7.
Among the many options I ended up with this pool of candidates:
Leica 280 f2.8 Apo (the older, non modular version) + adapter
Canon 300mm f4
Canon 400mm f5.6
Canon 300mm f2.8 (the non IS version)
Canon 100-400mm
Now, the Leica 280mm f2.8 Apo si quite big and heavy, the same can be said for the Canon 300mm 2.8. What about the Leica's optical performance? I did not find many info about. The Leica would be my first choice, more or less for the Apo designation and for the "name=quality" reason.
My budget is about 1500-2000 dollars, if it was more I was going directly with the Canon 300mm 2.8 IS or the Leica 280mm f4 Apo. I have used already the Canon 400mm 5.6 and found it nice but not astonishing, definitely not in the same league as Zeiss lenses. Its major advantages are probably its small size and weight.
What I am looking for is the best optical qualities (bokeh, apo correction, color fidelity, etc.), not the best AF or IS stuff.
Thanks for you opinion!