It is great to see the variety of opinion on photographer’s favourite focal length. Most photographers own two or more lenses and change according to the shooting situation. I thought it would be interesting to run a poll asking if you had to select only one prime lens which would it be.
The top image of my favourite old film camera was captured with the X-Pro1 and 35mm lens (50mm equivalent) which would have to be my lens combination of choice for sharpness and bokeh.

Please note this values are for full frame equivalent to remove any confusion over cropped sensors. Therefore if you shoot 35mm on a cropped lens the equivalent full frame is 52mm so you would vote for 50mm.

Now, everyone instantly opts for 50mm as their default choice but I want to you really think about it, many own a 50mm and rave about the virtues but in reality use it for specialised shots and have another lens for their everyday photography.

I realise this isn’t scientifically precise but this is about focal length not depth of field or compression.

The Final Results

If you want to give a reason why you made your choice in the comments I am sure many other photographers would value the insight.

Remember this is for fun, there is no right or wrong answer, you simply pick the one focal length you would choose if you were only allowed a single prime lens.