Any discount is a good discount really. The MKC is a brand new vehicle and it is in pretty high demand. I wouldn't go in expecting to get a discount. I'm not sure that Lincoln needs to do that to sell MKCs.
I purchased mine exactly 30 days ago, sticker price on my vehicle was 45,050, it's a 2.3 awd reserve with climate package and the tri coat platinum white paint as the only options. The window sticker also included a $740 discount for the AWD because the dealer was located in the Northeast. It was a dealer ordered car and had arrived the day I went shopping and was still wrapped up from shipping and had not yet been inspected. After short negotiation My dealer priced me at $42,450 which included a $1000 conquest incentive most people seem to be eligible for and $1600 dealer discount which I negotiated as I was willing to buy that day, did not require financing, and was willing to take the vehicle even though it wasn't optioned exactly how I wanted it nor was it the color I wanted.
All told I was at the dealer less than 3 hours and it was a simple no pressure negotiation, in the end even though my MKC isn't exactly what I would have gotten if I had ordered myself I'm extremely happy with the price, service and, most importantly I love the vehicle itself.