Only if your TV supports it. Many displays have a fixed 60hz cycle rate so even an 24hz signal will re-introduce judder when displayed. And on the other extreme, some TVs can detect 24hz content within a 60hz signal and adjust to a constant time slice (w/o introducing frame interpolation).It's worth upgrading for one very big thing - The Auto Switching for frame rate. Seeing a film in its correct frame rate without panning judder is the best upgrade for any rather juddery Apple TV.
Plus 4K film will look amazing whether you have HDR or not.
Only if your TV supports it. Many displays have a fixed 60hz cycle rate so even an 24hz signal will re-introduce judder when displayed. And on the other extreme, some TVs can detect 24hz content within a 60hz signal and adjust to a constant time slice (w/o introducing frame interpolation).
In general if your TV has a 120hz or 240hz panel you should be good for 24hz content, but the optimal settings on the TV and source input may vary.
Just do some upfront research on your model TV since YMMV with 24hz.
It seems that you have mostly higher end equipment. These limitations would be more common on entry level or older hardware. I would just hate to have him upgrade to the new Apple TV for a feature that may not work in his setup or his TV can already output from the older Apple TV.WOW! Nothing like putting water on the fire and confusing anybody and everybody!
Well my Panasonic TV is working beautifully with the ATV 4K, a 12 year old BANG&OLUFSEN DVD player, my 20 year old Panasonic VHS video recorder and now a Panasonic 4K UHD BluRay player.
All superb!