I have a 2020 MS LR+ and after test driving the Lucid Air two weeks ago (test drove a production AGT, not a preprod), I am 99% sure I am going to cancel the order even though it means leaving $1k on the table. I have a family of 4, with a 4.5 year old and 6 year old, and this is our only car. After test driving the Air, I agree with many in this forum that the Air is a smoother ride, has a quieter and fancier cabin, and would get better range. But.....
(before anyone starts aggressively counter-posting, please note that many of these are personal preferences. I am not hating on Lucid as a company, or the Air as a car, or anyone in this forum for having different opinions. I haven't even canceled the order, yet. This post is only about why my family is choosing to keep the 2020 MS, right now).
1. Trunk vs hatchback. After seeing the Lucid Air in person I was surprised at the trunk height. Where we are in life right now, with hauling kids and their stuff and doing manual labor on our house and yard, the Air trunk is too short and the MS hatchback is way better.
2. Bikes/skis. We have an aftermarket trailer hitch on the MS, which we use to carry bikes and skis. The company that makes that hitch has no plans to make one for the Air. The solution for the Air will be a roof rack, but availability of that roof rack is TBD.
3. Lucid Air mirrors always auto-open on unlock. Until that gets fixed with a software update, I'd have to cut a hole in my garage wall because the passenger side of the car is right up against the wall. There's a whole separate thread in this forum, on this topic. As noted in that thread, the only car I have is an MS and I know this is a feature on the MS (mirrors will stay folded if you want them to, until a certain speed). I do not know how many other cars have this feature. I only know that the MS has this feature now, and after giving it some serious thought I don't want to cut a hole in my garage wall to buy a $140k car.
4. Range. Until EA has a better network, or Tesla opens up its supercharger network, I think a road trip with the Air will be more complicated than the Tesla. Also, from what I've read in this forum, Lucid's nav is not great and most folks use a third-party route planner. I like Tesla's nav and have not had any problems with finding available Tesla superchargers here in the NorthEast. I understand this is very different for folks in other parts of the country.
5. Autopilot. I really like Autopilot on long highway drives, especially in traffic. I have not had any issues with Autopilot on the highway (although FSD regularly tries to kill me when driving in the city). We drive to the shore a lot, and in that last stretch there is often bumper-to-bumper stop-and-go traffic. Autopilot really shines there, and makes that more enjoyable. Lucid will have this too, at some point. But not right now.
6. Other software issues/TBD features. After reading about software issues in this forum, and experiencing some myself on the test drive, there are too many software problems/too man features are missing for this to be our only daily driver. For example, on the test drive, the delay between activating the turn signal, and the blind spot camera appearing in the dashboard, was noticeable and I did not like it. Also, there is no way to keep the cameras on while you drive. I use this feature a lot while driving with the bikes on the bike rack. Tesla has its software issues, too. For example, the MS doesn't always auto present the door handles, and Murphy's law dictates that happens when I'm carrying something with two hands, have only a free pinky to grab the door handle, and its pouring rain and now have to figure out how to fish the fob out of my pocket.
I'm not sure which I would choose if I didn't have a 2020 MS because I really like the steering wheel, the vertical screen, the manual air vents and other controls. From what I've read and seen with the new MS, I think I wouldn't like the yoke, horizontal screen, and digital air vents and other controls.
Take this FWIW and note that this could change. Maybe in a few years we don't bring as much bulky stuff on vacation, and there's a roof rack for the Air, and the mirrors stay folded, and there's a better network of chargers, and Lucid had made some major SW improvements.
But for now, the quieter/smoother ride and fancier cabin of the Air aren't enough to make us give up the 2020 MS (and we can't keep both).
Best of luck!