True (re cropping and standing closer) but it's not the same thing. You do lose more than just resolution by not using a teleconverter - effective/actual f-stop for example - at least that's how I understand it.
That said, I think Fuji's really done a smart thing here. You can, if you don't mind losing the "discreet nature" of the camera (which I think is a load of BS anyway - as I've said before, nowadays, the moment you raise a camera viewfinder to your eye you become indiscreet) have a 28mm and a 50mm that can be attached to the X100s which is a basic kit all for the price of less than a third of what it costs to own an M240 alone.
Granted the X100s is NOT a true rangefinder but in a pinch and for the difference in money (and probably some better high ISO quality) it'll do just fine. 🙂
Cheers,
Dave