Thank you Colin for the link and reply
Apart from any kind of comparison are you satisfied with the move to 300PF in terms of IQ?
Since I didn't own both lenses concurrently, I didn't do any side by side comparisons.
My feelings are that
- I didn't personally notice a dramatic step change in image quality
- there are several usability benefits in moving to the PF version
- these all mean you're more likely to take the lens with you on trips, walk around with it, be less reliant on tripods or monopods. These can all lead to using it more or being ready to catch fleeting wildlife opportunities.