I was curious to see how my legacy OM Zuiko 1.8/50 and 3.5/135 compared with the current 40-150 zoom. The Zuikos both have adapters to make it a 'fair' comparison: Subscribe to see EXIF info for this image (if available) Subscribe to see EXIF info for this image (if available) Obviously the legacy lenses are smaller than the zoom, when the zoom is extended. On the other hand they are a lot heavier and don't have auto-focus. Image quality is very similar in my opinion. Of course the 1.8/50 is significantly faster than the zoom, so I think it's worth carrying it with the rest of the kit.