Ah, I tried the Jumbo on. I will try the 15400 next time. Good point about different feel. Yeah, these two have always been head to head for me and since I have a soft spot for Patek the Nautilus won the day.
Funny enough, I passed by Wempe this morning and was greeted by Rudi Albers - who was also wearing a 5711/1A (I think it's been his daily wearer for a few months now). We both confirmed how comfortable the watch sat on our wrists.
It's interesting how two watches that serve such similar functions as the Nautilus and RO can evoke such different feelings. To my eye the Nautilus represents sensual/agile/streamlined/classical, and the RO rakish/muscular/precise/modern. Could easily see a collection having room for both.