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Nikon have the wide & mid range zoom very firmly over Canon. The Nikon 14-24 and 24-70 are significantly better than the Canon equivalents.
However this is being pretty picky. It doesn't mean the Canon ones are bad. I think if you want to use the nikon lenses then get a nikon body, sure you can use adapters but you lose your metering last time I looked. This isn't a big deal for landscapes or astro but personally I wouldn't.
Sticking on Canon mount, if you want to use a zoom the Canon 16-35 is very good but only when stopped down a couple of stops. It is poor until about 5.6
Getting more serious, the Canon 24/1.4 is a cracker. Also the 35/1.4 as well - this is one of Canons best, if you took a list of all their lenses the 35 would be in the top 3. The Canon mount Zeiss 21mm is even better than all of them for landscapes in my experience but you lose autofocus - again not a big deal.
This is just my thoughts on using them for land stuff. Haven't used them for astro yet, won't be long though.
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