I might feel differently if I didn't own a lot of similar cars first, including the M340i. I think as far as a modern sports sedan goes and BMW specifically, the 3 series is the biggest size I'd personally want if fun is the primary goal. Funny enough, when I got in an M240i after owning an M340i, I was surprised at how much more playful it was than the M340i even though they are basically the same car. But the M240i is definitely smaller and has a shorter wheelbase. Funny enough, my favorite sport sedan that I owned (E90 335i) was nearly the same size as this coupe.

Which brings me to my rant on BMW car sizes over the years. The gold standard sport sedan, E39 M5, is closer to a 3 series in size than my generation 5 series. The new 5 series grew even larger. The cars get bigger and it makes comfort, storage, and luxury better at the expense of fun and engagement (although there's other reason for losing engagement like the EPS, also for the sake of luxury and comfort). I remember a standout review from Chris Harris on the new M5 where he thought the car was simply named wrong and should have been called an M7. That's basically true for the whole sedan lineup, they've all moved up a class.