Thanks Zombywoof and PK! I've really been having fun with it. The Seagull neck is just right for me and I wish the Martin necks had the same specs.
I wasn't originally going out to look at Martins, but I could hear the Siren call from the first store I was at...
I was just happy to try a guitar that I had read so much about, and being far from disappointed despite the buildup and hype. For me that's more fun than getting to test drive a Ferrari.
Rick, do you want to try that exercise with the $40k D-28 Authentic?

That's a lot of Alpo enchiladas!
Bradpdx, the D-28 Authentic makes that $6100 Elvis Presley Martin look affordable now...
Williamfriggle, your old HD28V sounds very interesting, that's the next guitar I'd like to try if I am lucky enough to find one in a store. I liked the neck on the D18V that I tried, different from my Seagull of course but filled my hand nicely. Was it similar to the neck on the D18V?