Thank you for that input @Newcomer, I hope this helps people considering Carlos Santos.
Here's some more data and feedback in regards of lasts and fit, with references to other premium shoemaker lasts.
Carlos Santos lasts Patrik (@Leaves)
Carlos Santos - 234: UK 11
Generous last with plenty room across the instep, great arch support. For me it fits very close to Carmina Rain, maybe a hair wider. Honestly one of the most comfortable RTW lasts I’ve tried.