Any upscale kosher in LA?
I'd suggest posting this query on the Kosher board: http://chowhound.chow.com/boards/28
With that said we have friends who swear by Shiloh's Steakhouse in WLA. Can't vouch for it personally as we have not been.
Shilo's Kosher Restaurant
8939 W Pico Blvd, Los Angeles, CA 90035
Definitely post this to the Kosher board as well - Having eaten at the Prime Grill in Beverly Hills when it was open - I would place Pat's as being comparable - Shilo's also is very but I like Pats just a bit better -
Other that I have heard good things about but have not been to: Bocca Steakhouse and La Gondola.
If you are willing for a drive in Oxnard is one of the top rated Kosher restaurants in the US Tierra Sur - it is in the Herzog Wine Cellars
9233 W Pico Blvd # 200, Los Angeles, CA
Tierra Sur Restaurant
3201 Camino Del Sol, Oxnard, CA 93030
9025 Wilshire Blvd Ste Frnt, Beverly Hills, CA 90211
16610 Ventura Blvd Ste 3, Encino, CA 91436