Dpreview compared the Sony A7III, Nikon Z6 and the Canon EOS-R. The conclusion:

Even without thinking about lenses, it’s clear that Nikon and Canon still have some work to do to catch up with Sony’s half-decade headstart. It’s not an insurmountable difference, though and both brands have brought their extensive experience of ergonomics and user interfaces, which Sony should probably be worried about.

All three cameras can produce excellent images but the Sony more readily adapts to a wider range of situations. The Nikon acquits itself well for certain types of photography, while also doing unexpectedly well at video, but the Z6 has the least dependable AF system of the trio, which counts against it. Canon has tried to make an easy-to-use camera, rather than simply mimicking its DSLRs, but, while we’re not fully convinced by the results of this first attempt, it’s still a very able camera.

Ultimately, though, the decision is likely to come down to what lenses you own, which lenses you plan to buy and how much faith you have in each company to produce camera bodies to match your needs, several years down the road. Because, if you’re trying to avoid major costs later, the camera body you choose now is likely to commit you to a new lens system for the foreseeable future.

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You can get the new Laowa 10-18mm FE at BHphoto and at VenusOptics online store.

Phillip Reeve (Click here) tested the new Laowa 10-18mm 4.5-5.6 FE C-Dreamer lens:

The main selling points of this lens are the compact size and the widest focal length of 10mm. Laowa managed to produce a zoom lens that starts at 10mm – and at 10mm the resolution and vignetting figures look quite comparable to that of the Voigtlander 10mm prime – yet it is only slightly bigger and heavier (+120g) and you can zoom in all the way up to 18mm.
Laowa decided to do some things differently here compared to Sony with their latest UWA zooms: the emphasize is not on resolution but on giving you the widest possible lens in a small package, sunstars and usability with filters. Whether these main points appeal to you or not depends on your personal preferences.
If you are interested in a lens starting at 10mm but want something more flexible than a 10mm prime this lens might be for you.
If on the other hand you think you get a smaller and wider Sony FE 12-24mm f/4.0 G in a smaller package you will be disappointed, the 10-18mm won’t match it in the overlapping focal length range in terms of resolution and contrast.
The lack of exif data is quite a nuisance in a lens where electronic corrections (distortion and color cast) are necessary in many shots. I was using the lens mostly at fixed values of 10, 14 and 18mm to make post production a bit easier.
The biggest disadvantage for me is the flare resistance. With the sun in the frame I encountered ghosting and other artifacts quite regularly. Whether this bothers you depends a lot on what you shoot, but if this is something that bothers you I recommend to stick to the Voigtlander and Zeiss prime lenses.