Shims are just for adjusting the focus when you have PL mount installed.. it has nothing to do with you being able to change the mount itself. If you want to change the mount itself you take the cam back to Canon and pay the fee for each time you wish to do so.
This is not really a CINE lens. More of a broadcast or one-man band lens since it lacks the focus markings and is therefore clearly designed to be focused by the shooter himself. Also the range 18-80 in FF terms would be 24-105... You know like the Canon 24-105 F4.0 lens (which probably is close to T4.4 on its actual light transmission). I bet this is based on that design, the focal length range is tweaked down to wider which is easy to do when you sacrifice FF coverage for it. I think 24-105 was nearly parfocal (at least when it is new and the mechanism is not worn out) so probably on that not big adjustments needed either. So they added manual iris ring, stabilizer and that's what you are paying the extra for. Of course there's the zoom grip but for that you are going to pay more.
the dedicated GPU is very low specced. It took days for me to even find a reference what it was as microsoft didn't really mention that on their specs. And the testing against the macbook pro proves this comp isn't for editing. Yes it has touch screen and works as a tablet, but when you are editing you need power. This computer has only dual core processor so you better invest your money on a comp with better processor and better dedicated GPU which you actually need for editing
They should really remove the word "EDITING" from the title of this news as the tests show it really doesn't do much on that front with it's poor 2 core processor and very low specced nVidia GPU
This is one speculative review and therefore useless reporting that causes more harm than good. There is a review where the guy bought the most expensive 2700 bucks Surface Book and Macbook Pro that was 200 bucks cheaper. I can't remember the exact details but it was something like this: The Macbook Pro came out twice as fast and Surface Book had no way to edit 4K footage. It didn't even play it smoothly (with nothing added to it, just footage as it was) while Macbook played it even with effects added.