Yo CanopuS! Most people (not all, by any means), especially those on a budget, use small diaphragm condensers for overheads, and large diaphragms for vocals. The crowd seems split on acoustic guitar, where you can use 1 SD, 2 SD's, 1 LD, or one of each, in different positions.
The MK319 is a dark, smooth, mic, very useful for strident singers, especially some women. As I saw you've observed in another thread, as Guitar Center starts to blow them out, along with the MC012, which is a bang-for-buck all star, they're getting hard to come by. You can't get them cheap on line. You have to call a GC that still has them, then show up in person and shake them down. Audition the mic in the store, and make sure it works, as QC has been an Oktava issue. The ones that do work, work very well. Good Luck-Richie