|From Left to Right: Ruin, plastic Juggernaut, Grolar, and old metal Kodiak|
The plastic Prime warjack kit was a big change when it came out. Literally - for whatever reason (most likely due to the cheaper medium, or possibly the need to size up to maintain detail fidelity) the Prime plastic models were much larger than their metal precedents. You can still see the size difference with the metal Kodiak which was basically a reworked Juggernaut of the era.
Ruin is another step up the sizing chart (I didn't organize this picture quite right in hindsight). I was impressed at the size of the model when it came out, it being a very noticeable improvement over the original Kodiak in size and overall design (looking at them side by side nearly gives me whiplash). I figured it was a good indicator of what to expect from the eventual Grolar/Kodiak kit.
I was mostly right. The Grolar/Kodiak kit shares the same overall design and form factor introduced with Ruin's model, but once again (probably, again, due to being in plastic) the Grolar/Kodiak kit is another step up the size chart. It makes the Grolar/Kodiak kit easily the largest non-Behemoth, non-colossal warjack in Khador's model line.
I didn't think about it at the time, but now I'm interested in seeing how the Grolar/Kodiak kit matches up against the Behemoth in terms of relative size. Makes me more interested in seeing the eventual Behemoth resculpt, assuming that all of the Apotheosis character heavies are getting redone (which seems like a safe bet now that the Thunderhead and the Avatar of Menoth are on the release list).
The funniest/saddest comparison is matching up the Grolar/Kodiak with the old metal Kodiak. You could *almost* fit the Kodiak inside of the Grolar's model (almost). It is a remarkable improvement for a model that is supposed to be a big, burly, bear-inspired brawler. Shame about the Kodiak's rules, but hopefully they eventually embiggen those too.