Same, although in fairness, if I were a macro shooter, I'd probably be VERY excited about the 90mm macro

RED35 has made a great comparison. In short, the 12-45 is slightly sharper at the long end, the 12-40 on the wide end, if stopped down to f4. You loose a stop of light and the focus clutch, but gain 5mm and the size and weight advantage. I went for the 12-40 1:2.8 as I just throw in a 45mm 1:1.8 if I absolutely need that extra range, but gain that stop of light and love the focus clutch. The size and weight feels at home on my E-M1 II, but the 12-45 1:4 feels nicer on the E-M5 sized bodies.