Currently I have a studio that accommodates tabletop product photography with one of my 4x5 cameras, or my medium format system camera.  Although it would serve for limited portrait work, I prefer to shoot environmental portraits on location, with my 8x10, 4x5, or my rangefinder medium format camera depending on the intended usage, budget and limitations of the location.  I have carefully selected my equipment to provide a great deal of latitude in approaching a shoot, without sacrificing quality.  Large size negatives allow for aggressive cropping and maximum flexibility in reproduction sizes available to my clients' designers, although I have not abandoned digital; the image below was made with a DSLR two generations of digicams ago...according to my bag. 

Although the examples below are editorial, this should give you an idea of the resolution that can be achieved using 4x5 sheet film.  The shot was hand held on a Graflex Super Graphic at the annual Rough and Tumble Engineer's Association Harvest show.


The top and bottom were cropped to create a panoramic aspect ratio after scanning

Detail images were simply cropped out of the original scan. 


I employ a wide range of color and black and white films to convey mood.  A good example of this would be the images I made of the Stone and Key Cellars bottle (on spec) recently for an upcoming article on my tabletop photography process

This image was taken on Fuji peel-apart Polaroid film, which also yields a negative.  Above is a scan of the recovered negative.  The tone of the colors and the unique grain structure lend the image a "vintage" 1970's beer print ad look, appropriate for a holiday print advert.