FWIW, I have eight IM sweaters, and all of them fit the same in length, except for one. Could be that certain patterns are just shorter?
Don't know what ziss is talking about regarding blocky bodies. Mine are fine, although I admit some of the chunkier ones have pointy shoulders. Haven't seen that on NMWA kints, even when they're in the same style, but FWIW, I had mine fixed by a knit alterationist for not too much money.