Just for your information, I took a couple of test shots yesterday with the SL 24-90 and the Sony FE 50/1.4. When stopping down the Sony lens to f/3.6 to match the aperture of the SL zoom at 50mm the images appear super sharp and contrast improves substantially. I’m not sure there is any point in comparing the SL 24-90 to the A7Rii with fixed focal length lenses. The SL zoom is good but is no match to stopped down Sony primes on 42 MP. I can still do some comparisons but you’ll be really disappointed, I think.
Yes, please post the images.
Thank you so much!
Some examples comparing the SL 24-90 zoom to the Planar FE 50/1.4 and the Sonnar FE 35/2.8 on the a7Rii in an external link below as my upload capacity on dpreview is used up. The files are at full resolution. EXIF data is included. Same settings used in all (almost) except for shutter speed sometimes.
When I said you’ll be really disappointed by the relative performance of the 24-90, I meant that you’ll be disappointed if you need to crop. But then again, it’s a zoom so why crop. Also, stopping down the Sony primes to match the SL aperture at the same focal length increases apparent sharpness and contrast. This is particularly true for the FE 50/1.4 which is a bit soft wide open.
I’ve included crops in the first four pairs, I didn’t bother afterwards.
Pictures 1-10: Default sharpening in LR left on and exposure adjusted slightly in one or the other to try to match. Tones and WB only adjusted in the pictures with the motorcycles. It’s striking how similar the two look.
Pictures 11-20 (church pictures at ISO 1600): Default sharpening in LR left on and exposure adjusted upward slightly on the Sony images to try to match the SL ones at the same shutter speed. Also, temperature reduced by the same amount for all, SL and Sony. IMO the Sony captures the difference in tones better than the SL with the zoom at this ISO level. It's subtle but if one looks at the gate/door in the pair No. 20, for example, the Sony shows richer tones of the wood and it’s not due to WB. At the exact same settings (ISO 1600, aperture 3.2, same shutter speed) the Sony images come out looking slightly less exposed than the SL images. I then pushed exposure up a bit in (+0.15 on the LR slider) to match the SL level of brightness. The Sony shows less blown out highlights than the SL does at ISO 1600.
Pictures 21-42 (horse racing): Sorry, had taken the SL 24-90 and one Sony prime with me but ended up using the SL50 instead. What an impressive lens (have many more photos from the day). Default sharpening left on in LR, tiny tweaks to exposure and shadows here and there but most of them hardly touched. The micro-contrast of the SL50 and the look this creates wide open is jaw dropping. Take a look at the plasticity of the horses, especially in the first eight images. Those muscles almost pop out of the screen. The colors are gorgeous. The bokeh is smooth as silk. AF is not an issue and allows for precise and fast enough focusing with tracking to capture the action of horse racing. This 2016 Leica "Look"

lens is un-freaking-believable.
https://www.smugmug.com/gallery/n-7Wx3DS/