German pro player Katja Thater (who took down the 2007 $1,500 Razz bracelet) seems at home with Omaha Hi-Lo too. She just chopped an Omaha pot showing on the river with the board standing . Her opponent took the low, but asked to see her whole four-card hand, as is required at showdown... It was flipped so fast I missed it, but her opponent seemed satisfied with that glimpse and half the pot.
Interestingly, before taking up poker full time, Thater used to compete in dressage tournaments, and still participates in her spare time.