Used the X-T20 with the 50-230 lens again on Sunday to photograph my granddaughter dancing in the ballet "Alice" at the Bijou Theater in Knoxville. The light was pretty dim, so I had to kick the ISO up to 12,800. RAF files processed in basic SilkyPix, BTW.
I am fortunate enough to have them both. Horses for courses - cost is a factor of course, but if you look at value the gap closes. The 50-230 is my go-to for travel and anything that involves carrying it any distance. The 100-400 is superb for action and wildlife - but it is a beast to lug about.
Of the things ahead of the 100-400 on my "if I find a bag of money in the road" list, a good acoustic guitar is way high up it. Cyclocross bike for the wife, light weight commuter bike for me, second Fuji X body of some kind ... 100-400...
Side note: two good friends of mine from highschool and college did indeed once find a bag of $ in the road outside their apartment complex, after college. It was something like $4,000 in cash. They split it and gambled with it, I think.
Me, pretending to be religious for a moment: "Matt, don't you think the Lord intended you to do something better with that money?"
Matt: "...I the God knows me better than that."
Oh there are so many mad money things... I think top of my list for a long time has been a really nicely sorted Land Rover Defender. I've driven the things, I know all the drawbacks, I wouldn't want it as my only transport, but...