If you were in Europe I'd put mine in the post, US shipping gets expensive and complicated with shipping.
I haven't tried a Kato, but have a lot of other makers in the 240 range. Geometry wise every Carter is not the same, he has a kind of freestyle approach that in my experience either hits the nail directly on the head and is an amazing cutter or veers a little wide of the mark and is so so. The SFGZ range I found more consistent than the HG.
The ones I have are not heavy robust knives, compared to Kato and Watanabe they're laser like, but have better separation than a Kono HD.
If you buy direct from Carter, I'd order more than one of the same size and pick the one you prefer (assuming he has a returns policy, which I can't imagine he doesn't)