Korean's Skypass program is different in that elite levels are based on cumulative base miles, not yearly. Their lowest level kicks in at 50,000 miles, which of course would get you to GM status with Delta if flown in one year. However, you retain this status without having to requalify every year.

KE's Morning Calm Premium starts at 500,000 cumulative miles. That gets you SkyTeam Elite Plus status.

KE's top level is the Million Miler Club.

For a frequent flier doing 100,000 miles a year, that means it takes 5 years to get to SkyTeam Elite Plus in KE's program - when you would have already been an Elite Plus for 4 years as a Delta PM. I know which program I'd rather be in.