The worst would have to be an rc51 due to its postage stamp. Or mine due to its shortness.

1993 ZX-11 was so comfortable I fell asleep on the back of it.

I would say my KTM RC8 has an irrelevant passenger seat. It just snaps on and is a thick as a piece of 1/4 plywood. It also has about the same amount of padding. Looks terrible.

The 1098 looks equally crappy for comfort but the seat did replace the rear cowl so a bit more of an integrated look. Look terribly uncomfortable as well. Just less of an after thought.

I never mounted the rear pegs on either bike. The rear seat and pegs for both bikes get delivered in a bag.

The seat on a TLR is pretty nice, the passenger seat on the TL is better than the regular seat on most bikes now.

Rue rode many hrs on the back of the VFR 1x
Z went for a quick ride on th busa and said it wasn't bad.

EX500 is nice and plush too for operator and passenger

the rsv4's pillion seat is so small you could only put italian supermodel midgets on the back. And even they wont like it

My wife is always complaining of the Firebolt seat. I been looking for the touring seat for her.

I was a passenger on an F3 once or twice and it was pretty comfortable due to the banana seat.

F4i is fine for about 30 minutes as long as you don't mind all of your weight being on your hands/ wrists and don't care about seeing any of the scenery other than what is right beside you for a split second...:lol

Duc 900ss is surprisingly comfortable! Much better passenger position, more upright.