I have recently been carrying a Nikon D300 in lieu of Polaroid to check exposure in the field and, more importantly, to check composition. There are some caveats such as bellows extension factor. However, it really helps compositon. I often use film more sparingly. Some nuances with digital are important. I always use a custom white balance. The histogram only relates to JPEG and not camera Raw. Finally, prints from film even after a scanner and custom IT8 targets for color management are far more pleasing and accurate. I think the two worlds complement each other. For the time being I am still convinced that film is the way to go for LF.