The Kershaw CQC-6K and CQC-7K seem right in line with the size of the Emerson CQC-7, which I understand is a pretty popular Emerson model. If you compare one of the smallest of the collaboration pieces (CQC-1K) with one of the larger models Emerson makes (Roadhouse), the size difference should, unsurprisingly, be significant.
I would guess the target audience for the CQC-6K/7K/8K are going to be those looking for an EDC knife around the size of the CQC-7, and the sizes seem to match up well.
Also, Emerson uses titanium liners, not steel (at least according to
Emerson's site). One of the key benefits of titanium is reduced weight, not strength (especially when it comes to lock face contacts). That said, the lock face contact width on the collaboration pieces seems to be just as well engaged as the Emerson.
The smaller models (CQC-1K through 5K) are likely targeting those looking for something closer to the size of, say, a Mini-CQC7 or Micro-Commander. Based on the published specs, those knives seem right in line there too.
Those looking for something larger (eg. Commander, Roadhouse, CQC-15, etc.) are likely not the target audience for these collaboration pieces.