Uh, this is gorgeous. What are KC doing? I don't think I've seen that cable pattern before, it's quite... linear and structured, angular, and with the cable actually fading perfectly into the rib.. gorgeous. The drop shoulder construction means you can focus on making the cable rather than trying to fit it into a raglan, and god I know I have a million things on the go but I can't resist this.
We'd recommend the King Cole Homespun DK for this if you want to recreate the fleck, but I think the stitch definition of the King Cole Luxury Merino DK would make those cables look absolutely stunning.