For text documents with line drawings? For sure, absolutely -- especially when it's JBIG compression like fax machines use (or even Group 4 before that). If it

For text documents with line drawings? For sure, absolutely -- especially when it's JBIG compression like fax machines use (or even Group 4 before that). If it's a full scale photograph full of grayscales that's been dithered, then it's a harder comparison to make. Because obviously a ton of useful detail is lost in the dithering, in a way that isn't with lines and letterforms. So the comparison would really have to be with a terrible, blocky JPEG super-compressed file. In theory the JPEG should win.