I've got both in my collection. IMO - they're not in the same class. The EG Shannons are sublime. The cordo Carminas are excellent but they feel a bit stiff and somewhat bulky. The EG last is elegant. Both were MTOs.
I have a collection of shell boots that include 4 pairs of Alden, 3 EG, 2 Carmina and the Allen Edmonds Dalton. Of all of them, I have found the Dalton to be the most comfortable, largely because the shell was cut thin, making the boot a little more pliable. Also, the AE last is a good fit for my foot. At $700, they are pricey. But they are incredibly easy to wear.
If this is a Galway MTO for green on green, I am afraid I misunderstood. I would prefer to go with the green and suede combination but with the suede in brown as shown in the Galway photo supplied by StevenT.
Leaves, do you have any photos of a green/green combination you could share? I'm willing to be swayed, but the brown suede lends a wonderful country look to the boot and makes it compatible with a wider variety of trousers.
I have two other pairs of Galways...