Shoot, looks like I'm a little too late to give you advice on K140, but hey, for the next person...
We had K138 and K140 and had no issues with sightlines or leg room (we're 5'9 and 5'10). You also have the extra cushions stacked right behind you, and we were happy to grab those at the intermission for a little extra padding.
What was an issue for us was that they let the people who'd come in late come and stand inside, but not sit down. Most st