on my P67 I have found Ektar to be outstanding with the 55mm F4. That same lens with this Acros on a bluish evening comes out flat, but I sort of expected it given the lighting. A more dramatic sky would have helped along with tripod weight. Even with the mirror up the P67 has a blasting shutter. However, I try to remember that this is film and BW. It has a minimialist quality while still retaining mixed, albeit, mid tones. My flatness appeared due to the lighting at the time so I'm not knocking the film, I just think it is one of the added nuances of film. Your results depend on tangible, physical realities of light, tangible film, processing liquids and of course the dust I get on my negatives no matter how hard I try. So one roll of intense sharp color and one of mixed BW from the same lens. I say just keep shooting and if you are able process at home. Color is just as easy as BW. In fact I find it faster to raise temp for color than lower for BW.