Does anyone on here actually have the 50-150S? I was initially very interested in this lens but lately I have really been thinking: The 16-50S is already a pretty hefty lens, no doubt making it a 2.0 on the wide end contributed to that. Samsung made sure to differentiate themselves by doing so, but as a mirrorless system I've been really wondering about the weight and size of these lenses. A 16-50S that was a constant 2.5 would still stand out as the second fastest zoom for APSC (Sigma is 1.8 but only 18-35 and not IS) in the world while managing to be lighter and smaller than the current 2-2.8 S zoom. I have the 16-50S and to be honest, I'd rather have less weight and mass than f2 on the wide end. Not to mention, a constant f-stop zoom makes things easier...and consistent, especially for manual shooting! So after so much researching the 50-150S, which is apparently optically brilliant, I started wondering if a 50-135 f2.8 would not only be sufficient but also lighter, smaller, and less expensive. At 2.02 lbs the 50-150S is heavier than a Canon 70-200f4 IS (what could be considered the FF equivalent DOF and and FOV wise) although still substantially lighter than the 70-200 f2.8 IS. 135mm on a crop sensor is still good reach but being lighter and shorter would be welcome.