Did you check visible (not only blue) as well to get a fair comparaison with Meteosat24 ?
Usually, with Windy, you can see a difference between low level cloud and higher level thanks to the brown color of the low level cloud which is very useful to differenciate those clouds from the others (something that you cannot see so clearly with Meteosat24 images). Now, since beginning of Feb, Eumetsat is doing maintenance and Windy has to use less accurate images. This maintenance will be over the 4thof March so high resolution quality should be back. See below the detailed explanation from Eumetsat : https://www.eumetsat.int/rapid-scanning-service-schedule
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