I put 3 through college and one through law school, the middle guy is still going to college, a pro student...
and now I am on social security, I would also love the 100-500 but too much money for the extra I would get over my 100-400Lii and I still have the 90D and 5DIV that I use it on
My youngest wants to go to medical school. Good to know there's hope.
After buying the R7 + RF-S 18-150 kit, plus a spare Canon battery, plus couple of UHS-II memory cards, I was hoping to put a pause on the camera gear spending for a bit. But I sold my 7DII a week ago, and the proceeds from that will cover the RF 100-400 at the current sale price. So I'm justifying that as a trade rather than a new purchase.
But you bring up a good point, whether I should keep the Sigma 100-400. The only true EF body I have now is an EOS 100 film body that I haven't used in probably four or five years. I can still use the Sigma with an adapter on my M5 or Sony. My older son uses the M5 for astrophotography, so he might get good use from it.
Driving home from meeting the guy who bought my 7DII last week, I suddenly realized that for the first time since I bought a 20D in 2004, I don't have any body that can natively take my EF-S lenses!