This depends on the design of the lens, the coverage (the angle) and the f-stop used. All modern WA that are derived from the Zeiss Biogon, do have less vignetting than classic WA designs. The Biogon has introduced an angle dependen pupil magnification and has therefore a better performance than the cos4-law predicts (at the cost of a little distortion)

I do not need a Centerfilter on my Grandagon-N 6,8/90 beyond f16. Slide film is usually more critical than negative film in this respect (regardless of color or B&W). I do use a centerfilter below 90mm.