Hey everyone, I'm new to photography and wondering how much people spend on lenses compared to the camera body they're mounted on? Does it make sense to buy a higher end lens for a mid range camera, or would you be better off getting a slightly cheaper lens and spending some of the money on a nicer camera? Mainly wondering about used gear...

Currently shooting with my SO's D3500 when she isn't using it, and thinking of buying my own. Considering a used Pentax since weather resistant lenses seem easier to find for them than other brands...

Edit: how practical is it to use a Pentax lens on a Nikon with an adapter, and vice versa? I assume the electronics like AF and VR won't work?