What Ian said. While the West Coast school of large format emphacized sharpness and clarity, that's a style which large format was capable of facilitating. That's not what large format forces you to do. In fact, using large format equipment is arguably the most versatile means of producing a photograph. You can literally do things with LF that you can't do with other types of equipment, or can only do with great difficulty.
If you want selective focus, imagine how much easier it will be defining what's in focus and what isn't with a 4x5 inch or 8x10 inch viewing screen, instead of a small reflex viewfinder, or a 2" LCD screen. You have access to the widest variety of lenses -- even ancient lenses from the earliest days of photography, with all their weird and wonderful optical "defects" can still be used. You can make your own lenses from simple optical elements, cardboard tubing, and duct tape. You can do, almost literally, anything you want. Check out Jim Galli's website, for example, for examples of large format photographs which use the optical abberations of old lenses for definitely non-sharp pictures.
What large format doesn't do well is fast photography -- if you can't imagine a portrait session without a motor drive, you're in for a shock. If you need to make 256 pictures in order to later select the six you really wanted, large format is going to frustrate you. Large format is deliberate, structured (in the operation of the camera, anyway,) and organization pays big dividends. You really ought to try it, if for no other reason than to know from personal experience what it's like. I'm betting that if you can get past the mechanics of using the camera, you're going to really like the tonality a large negative provides, even more than whatever degree of sharpness you're looking for. Just remember that large format is a very deep well -- because it's so versatile, there's always more you can do with it.
Mike