Objectiv is not designed for listening. It is for shooting 
True, but the lens has to stay in one piece and then eventually focus on something. 
I had a 50 1.8 for several months. Bought it just for the hell of it (and to have a slightly more automatic alternative to the almost-impossible-to-focus vintage Takumar 50 1.4 I usually use). It's a much better lens than people give it credit for, though build quality, quick focus, and noiseless operation are not its strong points. Its upgrade, the Canon 50 1.4, is not nearly as much better as people are trying to say. I've seen the focus mechanism completely destroyed just from a minor front impact on the 1.4. Still, I had the front half of my 1.8 completely knocked off when someone barreled into me while carrying a light stand. With the help of a little super glue, it snapped right together again. The image quality wasn't absolutely -perfect-, but any issues it did have were not noticeable, save for some very slight G/P edge fringing in two of the corners which changed based on focus (rotating elements). I got hundreds of shots out of it afterwards, even after gluing it together at least 5 more times from various collisions. This is expected, as I do not baby my equipment.
You can argue, regarding unbroken copies of course, about microscopic fringing, edge sharpness, or the particular way the bokeh has chromatic aberrations in its little circles/hexagons, or whatever other BS the pixel peepers try to pull to justify spending 6000 bucks on Zeiss lenses if you want (don't get me wrong, I know it's nice glass).
However, at the end of the day this lens looks damn good when used by a sufficiently skilled photographer. The main reason I don't use it anymore, or at least have some of the mechanisms frankensteined for another project, is that I lost it at a gig after sitting it down during a rock concert. Their producer eventually selected the picture I took with the broken superglue lens to be the album cover, so minor aberrations obviously don't matter that much if the picture is a good one.
One last thing: In my experience, a plastic barreled lens such as the 50 when attached to your camera is less than likely to gouge a rather ridiculous amount of flesh from your shin if the camera happens to fall from a table onto your leg. The Takumar leaves scars your grandkids will see. This is, of course, because the Takumar is much sharper at the edges.
