Angle of view comparisons?

I am interested in a digital SLR for landscapes, especially wide angle 
photography.

I see lots of lens reviews for various cameras, but what I am looking for 
is something that compares them using angle of view rather than 25mm etc. 

I am trying to decide if I really want a FF sensor or something smaller, 
OK I want a FF sensor, but I guess I am trying to decide if bigger is 
better.

Is there a comparison of 12mp smaller format camera/lens with a 12mp full 
frame sensor at various angles of view? Is there something inherently 
better about bigger lenses and sensors? I think I read that a bigger 
sensor has less noise, but is there anything better about the lenses?

Thanks,

Steve