Thank you to all of the UHH community who responded / reported. Below are the summary statistics. I needed to 'normalize' the data to get the summary counts, so maybe a few lenses were 'upgraded' to the current model if you only reported a focal length. The table shows those lenses with 2 or more responses.

As I've long suspected, the Nikon community members are disproportional to the Nikon worldwide market share. Or maybe, these numbers better match to their relative strength in N. America market?

The most popular prime was the Nikon 500mm f/5.6E AF-S PF ED VR

The most popular zoom was the Nikon 24-70mm f/2.8G AF-S ED

The most popular super zoom was the Tamron 18-400mm f/3.5-6.3 Di II VC HLD

The Nikon 200-500 and the Canon 100-400 tied as the most popular super telephoto zooms

If you filter and count your images with 2021 shooting dates in Lightroom, what surprises do you find? Do you use your own usage statistics to plan to sell unused lenses / cameras? Or maybe, to change the lenses you'll use more in 2022?

Personally, when I sort / filter my 2021 statistics in Lightroom, I see have still have a lot of culling to do from the November travel and multiple architecture boat tours in Chicago in August. Picking the exact total winner isn't possible yet. What I do note, though, is a better and more equal distribution of lens usage through 2021.

Usage, that's really the idea of this annual review of images and lenses used. I don't own any lenses, (nor cameras) that are not actively being used. Most, of course, are not every day / every month. But all are now being used to create 'keeper' images every year. It is this annual review of usage that helped me a few years ago to get rid of underused equipment and to push a few lenses off the shelf and back onto camera bodies for more active use.

Preliminary results say the 600mm extended configuration of the EF 300 f/2.8L IS II and the EF 2x III teleconverter have moved back to the top place in usage as I've had more time / opportunities with wildlife in 2021 as compared to 2020. Again, the incomplete culling skews actual results, but of my four bodies and 5921 images in 2021 currently remaining, I see the EOS 5DIII still being used most and the more frequently lenses with image counts in the 300 to 500 range.