sleeping most of the 10hr flight. I was out right after dinner and woke up with a little over an hour left. Got up to use the restroom and stumbled in to a pretty swank lounge. Stewardesses were there to wait on you hand and foot. I wasted 10hrs of luxury.

I had to enter my ticket info into the Request Mileage Credit section of the Delta site. Other than that I didn't have any issues getting Delta MQMs for the flights with Korean Air. This was two, almost three, years ago and I had purchased the flights directly through the Korean Air website.

I just looked at https://www.delta.com/content/www/en_US/skymiles/earn-miles/earn-miles-with-partners/airlines.html

Korean Air is now a Tier 4 partner. So looks like you may have issues getting those MQMs now.