I think MSN-SFO is the longest in the UA network. While I think I would prefer an E45 on the A side in Y, and 1A on a 753 in F, the E75 is definitely very high up the list of narrowbodies for comfort in both classes (one of the only domestic F seats with direct aisle access and much better than the CR7). Nothing wrong with flying on it for 4.5 hours!