[toni-a]

In this sample the problem is evident, especially to the lower right, I was surprised when I saw it, Canon will brake their own record I think set by Canon 17-85 17 years ago ???

[Klaus]

I think that's more purple fringing. CA profile correction was activated for the sample images.

I suppose the lens is more meant as competition for smartphones.

[davidmanze]

5.5px corner CAs (based on a distortion corrected image, without CA correction)

You don't have this every day, too.

Corner stretching from correction makes itself felt in corner softness and CAs ........ 
   Canon's got a bit extreme with their distortion figures ......to the detriment of the lens's overall performance ........

[Klaus]

I will test this lens in corrected mode only - nobody on this planet will use images in RAW mode.

I've done the MTFs in the meantime - they are somewhat higher than expected at medium aperture settings. Not sure why.

I suspect that the RAW converters struggle with the excessive color fringing whereas Imatest can see "through" this.

[thxbb12]

A field review which confirms the findings observed from Klaus' samples: https://admiringlight.com/blog/review-canon-rf-16mm-f-2-8-stm/

[toni-a]

Well I was planning to get it despite shortcomings till I saw Sigma 20mmf2.0 coming ....

[Brightcolours]

Well I was planning to get it despite shortcomings till I saw Sigma 20mmf2.0 coming ....

And on what would you mount that Sigma? BTW, 16mm and 20mm is quite a difference..

[toni-a]

RF mount should come soon, I won't need it before summer, in Qatar street photography is tricky otherwise nothing but parks and the desert and a few well known urban landmarks

[Klaus]

Just for the fun of it - it has a peak vignetting of 8.32 f-stops in RAWs. ;-)

[Rover]

Remember the times when 1.5 stops was considered "heavy vignetting". Haha.