I am currently a Los Angeles based Platinum Medallion. Earlier this year I was a NYC based PM. That said, I have been only disappointed with Delta's upgrades this year.
I have gotten less than 25% upgrades on domestic flights this year and I can't say that day flown or location seemed to matter for the flights I was on. I did have better success in being upgraded to F on flights I got rescheduled on than on orginally booked flights (I had a misadventure arriving to JFK a couple months ago and needed to be rebooked to get to LAX, and that took the TA ~50 minutes to accomplish).
And to think that I never got the 1K bonus miles for having to sit in whY on NW as a PE....
