Thanks a lot guys, glad you liked it.
Bjørn: Indeed. I guess that the optics/coatings are the same on the K and the Ai, mechanically they differ of course.
Bent: Actually, I do not think AF would have helped me much here. I needed to pre-focus to be sure I had both the (bumble)bee and the flower in focus, not 100% successful in all pictures I'm afraid. All were hand-held for the flexibility of changing target, a tripod would have helped in other aspects though. Do you see any real-world difference between the results from the Sonnar and the Gauss by the way? Thank you for your comment.
Anthony: Thanks. In the first one I do like the framing of the background flowers, which makes it more tidy than the second one.
DNSJR: Thank you. I have seen that you have contributed with bees as well, you have some of them almost drowning in pollen. Pretty extreme.
Jakov: Thanks a lot. I also feel that the colours work. This lens is nice for bokeh believers of course (I am one of them). All are taken at f/4, I stopped down a bit to have some DOF for my subjects.
Frank: Thanks to a fellow bee photographer. I know you did a series of this topic earlier, pursuing the in-flight picture. It is actually a bit harder than it seems (which you know), you have a lot more experience than me by now.
Akira: Thank you. I also enjoyed the interaction between the species. There were no real confrontations though, as they were all too concentrated with their work.