[Brightcolours]

My Nikor 58mm F1.2 is also not that sharp wide open across the frame, it has every fault going including fringing veiling  and a curved field of view....but frankly F1.2 is not really what one would use for landscapes, rather for portraits and shallow DOF.

 

 You could try changing it for another, but it didn't look so bad anyway, best to use it for where it will shine, tender bokeh and nice melting backgrounds!

55mm f1.2? ;-)

 

If indeed it is a 58mm f1.2, nice investment.