I assume that you're flying DL9375, a codeshare on KLM metal.

In that case, the recline is even greater than the recline in Delta Economy Comfort. It almost makes for pleasant sleep (considering you're in economy).

Also, as your close to the front of the plane, you should be served food and beverages first, as well as be first to disembark after World Business Class; so you'll be near the front of the line for immigration in AMS.

When is your flight? I'd recommend the "A la carte" meals you can pre-order on KLM.com. They're a bit spendy, but they're much better than regular economy food, and make for a more pleasant flight.