I have a TK4. It is a beautiful piece of design. Slim small & lightweight, with a great blade/handle ratio. It is very comfortable in my hand. As Ken suggests, design features have overcome the small size. The tang corner is sharp & sticks out a bit when shut, but this has never caused me a problem.
I never viewed it as a gentlemen's knife though, It is a utilitarian thing I carry & use for dirty tasks. There is a tiny amount of play in the action, that is only noticeable when I fondle it, not in use.
The FH9 is the same size, weighs a bit more, looks stunning, has the same steel & no play in the joint. Here are my small Fallks FH9 on the right
The FH9 has a pocket clip, & fits well in a coin pocket.
I never viewed it as a gentlemen's knife though, It is a utilitarian thing I carry & use for dirty tasks. There is a tiny amount of play in the action, that is only noticeable when I fondle it, not in use.
The FH9 is the same size, weighs a bit more, looks stunning, has the same steel & no play in the joint. Here are my small Fallks FH9 on the right

The FH9 has a pocket clip, & fits well in a coin pocket.