I've heard nothing but good things about the WS hoody personally. Both from fellow hunters as well as online research. I haven't tried it personally.
I did manage to get the Kelvin Hoody today though. I will say that so far it appears to be what I hoped it would be. I also have the Kelvin lite hoody, so I was able to compare the two apples-to-apples as they are both sized large. The my kelvin lite weighs in at 17 oz. while the kelvin hoody weighed in at 23 oz. The kelvin hoody is a more generous fit. The interior fabric is more of a slick material like much of the outer fabric, which makes it easier to quickly throw on over whatever layers you are wearing at the time. The sleeves are more of a relaxed fit vs. the tighter fit of the lite. The cuffs are somewhat elastic and give more space for gloves and sleeves in your underneath layers. I would say that the kelvin hoody is slightly noisier than the lite, as the face fabric seems be constructed more similar to Sitka's WS lamenent pieces rather than the softer face fabric that you would find on the lite and/or kelvin active (which I also own). The kelvin hoody seems to have larger hand pockets and a larger chest pocket from what I can tell. This piece also has two mesh lined pockets on the interior of the jacket that I would probably use for drying out gloves and such. In my opinion, this piece is more a cut and dry glassing/stagnant piece that the kelvin lite is. Also, the hood on the kelvin hoody is larger/less contoured than the hood of the kelvin lite. This leads me to believe that it would be more ideal to keep wind of the users face. In contrast, the kelvin lite's hood is more form fitted and doesn't come forward enough to block the users peripheral vision. So some folks may prefer one vs. the other depending on scenario. The kelvin hoody is more consistent and less strategic in regard to the insulation layout, where as the kelvin lite is sort of body mapped with it's insulation placed intermittently around the garment as if it were designed to be used under some miled activity.
I think for my use I will turn more to this new kelvin hoody as a dedicated puffy considering how much easier it is to throw on over layers, the increased amount of primaloft, as well as the design of the larger pockets and the interior pockets being well thought out. I think the hood will also come in handy with crosswinds and such.