I'm thinking of selling my PL 15 and PL 25 for the Sigma 18-35 Canon mount with speedbooster making that lens a 1.1/1.2 12-25ish zoom. I know the Sigma is heavy, but I get tired of switching out my lenses. Also note I have the Nocticron so I am using that for the long end and I am used to using a heavier lens. Although the Sigma is almost twice the weight of it. I'm a big video guy and am currently using the EM5 II for now, but will probably upgrade to either GH4 or 5. Anyone have opinions on this or did something similar? Am I wasting time and money thinking about doing this? Am I paying too much to switch out for conveinence and not really gaining much in return? Any thoughts or opinions would be appreciated.