Glad to have you here! And glad that you like your C-Max. As an ex-New Yorker & still living on Hudson, I see quite a few C-Maxes around.
The S-Max is Mondeo based, while the C-Max is based on the Focus. If Ford had brought the Grand C-Max or S-Max to the US, it would've been just the right size for us, but the C-Max is brilliant for city living as it can squeeze into spots a lot of other cars can't fit into!
Also, side note, the S-Max is now available in Europe with a 2.5-liter hybrid!
2021 Ford S-Max Hybrid, Galaxy Hybrid: Dying MPVs go out green (betweentheaxles.net)