I really appreciate the light weight and portability of this lens and R5 combination. The IQ is superb and the files leave a huge opportunity to crop.This shot is taken at about 6-7m distance and it's a small bird so you can easily crop to 100%. However, the more you crop the more you will see noise appearing even at fairly low ISO values of around 3200. I have found Topaz does an admirable job at cleaning up this really fine noise but I don't want to stray in to high values because removing noise comes at the cost of removing detail from my experience. With the lens fully extended you are shooting at f10 so good light is a big bonus. At f10 you find the background bokeh might not be a pleasing as it might otherwise be but if you are lucky enough to have a degree of background separation then it's not a problem. Wildlife doesn't perform on command but choosing your spot to shoot from helps improve the chances!
For the record, this shot is ISO 2000, 1/2000th f10. No PP whatsoever, just reduction in file size for posting!
View attachment 1141