This is an impressive coat and it is clearly well constructed. I wear a size 40 US coat and the 790 size large is right for me. It fits well over a sport coat and still looks good with only a shirt. I prefer 100% wool but this fabric is very nice and most people will appreciate that it has a smoother hand than Mackinaw wool, for example.
The only improvement that could be made is either for the liner to be made of a better fabric than nylon (e.g. cupro), or for only the sleeves to be lined so it’s still easy to put on and remove. Lining a wool coat with polyester undermines wool’s natural ability to breathe while insulating. The coat would not block wind as effectively, but for me this trade off is worth it because layering is better than wearing one outer layer that traps heat… and moisture.
If you can only own one wool coat, buy one that is totally unlined or has a liner that is more breathable than polyester; it will be more comfortable across a wider range of conditions. Having said that, this coat is perfect in every other respect and I am glad to have it.