I have the Moonwatch and the CK 2998 Limited, which has the same case as the FOIS.
I often read that the FOIS would not be or wear smaller as the Moonwatch but in my eyes there is a significant difference. While I love the Moonwatch I really think that the CL suits my 18 cm wirst better. It does wear smaller and looks sleaker. So I would recommend the FOIS when someone is looking for a smaller Speedmaster.
That being said, the CK has two downsides that should be the same for the FOIS.
First: the lume is ridiculously poor on that one. The minute hand has just a very thin line. In the dark the watch becomes a Meistersinger - a one handed watch.
Second: the readability (is that a word? I am no native speaker) can be bad. The alpha hands tend to disappear in a certain lighting.
Nevertheless I would say that the FOIS could be a good choice for you.
