A question: Wide angle, 12-50, 9-18, 12 f/2

the 12 f/2 is expensive

I have the 12-50... not sure about it regarding landscape in the 12mm range

this is the question:

Is the 9-18 f/4-5.6 better than the 12-50?

is the 12 f/2 (much) better than the 9-18 in the 12mm range?

Thinking about landscape photography, but also architecture...

Appreciate to hear from people who have experience shooting with these lenses...