Manfred,
I myself also use a Windows laptop as my main computer, mostly because my clients use Windows and I also deal with Microsoft's technologies a lot. No MacBook has a LAN port anymore, and I have to use one when I go to my client's data center for example. I'm also conscious about weight since I have to carry the PC all day; so currently my choice is a Panasonic Let's Note SV1 laptop which is under 1 kg / 2 lbs. This is a company-provisioned laptop.
At home I got my big monitors and comfortable workspace but the problem is when my wife and I both work from home usually I'm the one who has to work in the living room
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A 12-inch display just doesn't cut it so I needed a laptop with a bigger display.
The company MSI is a client of mine and when I told them my hobby is photography
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and I'm looking for a new laptop they loaned me an
MSI Creator 17 B11UH laptop. The display is wonderful and it's blazing fast but sometimes it gets too hot when I put it on my lap
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Plus, the power draw is 230 W under maximum load so I decided the laptop is not for me.
Now I got myself a 16-inch MacBook Pro which is great and runs Lightroom really fast, so far so good. At 2.2 kgs / 4.9 lbs it's destined never to leave my living room, though.