How about for second never-before-done lens a 300-800/4.5-8 internal zoom lens to compete with and outdo the Sony 400-800/6.3-8 lens which seems quite popular. Sharp copies of the Sony appear to be very sharp, although there also seem to be inconsistencies. The Sony is 13.5 or so inches long and has a 105 mm front end. A bit over 5 pounds. All reasonable to me as a reasonably fit old person. The advantage of such a lens could be handling versus the 200-800. Zooming is slow and manual focus is a pain. I have trouble finding the ring for manual focus and have tried other stick-on surfaces to improve it. Without much luck. An L version could-should improve on the optical quality of the surprisingly good 200-800. For a price. A cheaper version price competitive to the Sony should be able to match it optically.
For me that is a get it done now Canon. The Canon rep is going to be showing equipment this weekend at the local (100 miles away) photo store. My plan was to stop by on my way home and lay hands on the 100-300/2.8 and the 70-200 Z lens. My current 300/2.8 is almost 36 years old. Still works fine but weighs more than the 100-300 and has limitations at higher frame rates. That store will also have that Sony 400-800 and likely the 100-400/4.5 which is extraordinarily attractive to me. Those two lenses and an A1ii would not be that much more than a 100-300.
Photo gods, what am I thinking? That RF 100-500 is still my all time favorite lens. But that bokeh of that Sony 100-400 is beautiful from early pics I have seen, and that Sony 400-800 seems like it will do just fine.
