Thank you very much for your insightful feedbacks!
I'll end up going back to a more neutral WB on the second one.
As far as the stitching goes, I had the Otus in the bag, but I don't see any reason to stick to a meager 36mp (be them very sharp) when 200mp can be done fairly easily.
The 135mm APO has some downsides compared to the Otus, the worst one being the amount of focus breathing, but it is as sharp and nearly as well corrected colorwise so why not use it, especially on subjects that are at some distance like these?
It all really depends on the level of technical quality your are trying to achieve accross your work. I have been shooting for very large prints for years, I don't see why I should stop now that both the hardware and software have reached such a high level of suitability to perform stitching with perfect and reliable results.
Here is another one from the same series. Printing this less than 2 meters wide just doesn't make a lot of sense in my book. I like being able to put my nose on the print and see every single needle on the pine trees of the middle island.
Which one of these 2 versions do you gentlemen like best btw?
Cheers,
Bernard