Awesome! Cool lenses.
But I assume the photo of the camera body is an early prototype (texture, labels, circle around mount) and the final product will look better
and this would also explain why its outline might appear to be smaller than the K-3. Maybe the FF won't be much bigger than the K-3, but I really doubt it will be smaller
One other thing is that even if you line up two photos so the mount is the same size, it doesn't mean the rest of the photo will necessarily be representative of the relative sizes. If you use different focal length and perspective/distance, you can change the apparent "size" of objects. The two photos might not have been take under the same conditions, so overlapping them is not perfectly accurate. Though, a FF smaller than the K-3 sure would be very tempting