These are on Forest last which is a bit generous fit. I know that for simpson or alcudia last you usually need half a size more than usuall because they are very snug lasts.
It's my new summer shoes, @laufer. In the 888 last, I have to wear a F width but the 808 last is more generous and has a more smooth and rounded chiseled toe box than the 888 last which is more distinct and more elongated. For me, the 808 last fits more similar to the 202 last but not as generous as the 606. Hope this helps :)