In some of the questions I have asked here, some of the terms frequently used to describe the difference in image quality between the cheaper lenses and the premium ones have been increased contrast, better sharpness, better colour saturation, colour rendering among others. I have also seen similar terms used on sites that do lens reviews, and they mostly cover CA, distortion and resolution.
To this end, I was wondering whether there are any standard tests available to quantify these parameters:
- Colour rendering/saturation (see related question)
- Sharpness (many sites seem to use MTF resolution charts for this)
Also, are there any sites that evaluate lenses based on the same, as it may not be practically possible for the average user to perform these tests?