The 26L is not a huge pack but it fits more than I would ever carry. IMO perfect size because I will use this when I travel and it easy fits under a seat.
Here it is with my 5d2 with a 24-70 plus 3 primes and my 100-400. I could put my flashes in the small side too.
I have an alternate setup that fits my 7D2 with the 100-400 mounted and the 5d2 with the 24-70 mounted plus 2 extra lenses. This is probably how I will use it most of the time. I can show you a pic of this if you want to see.
For me the Kenti can fit a lot but I don't think its designed for that. I prefer just 2 mounted bodies or 1 body with 1 or 2 extra lenses. The 2 side entry is awkward if you have a lot in it and your changing lenses. I like the Kenti if I have other stuff besides photo gear.
So I guess the answer is yes the 26L is larger and can hold more photo gear but side by side the size is pretty close
This is another good review to show what it fits