My old D7200 was very good for noise on astro shots - I've not tried my D750 yet on astro
The D7200 would be a massive upgrade from a D90 - I went D90 to D7000 to D7100 to D7200 then D750. And the Tokina 11-16 is stellar on a D7200
You can use any lens for landscape - from ultra wide angle to get the whole vista with maximum depth up to telephoto to isolate subjects and compress depth of field.
For ultra wide angle The Sigma 10-20 or better still the Tokina 11-16 is hard to beat though.
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