How do Mini V-brakes compare to cantilever brakes for Cyclocross bikes?
Correctly set up V brakes don't make feathering any harder or easier than correctly set up cantilevers.  What you give up with V brakes is clearance--for things like mud.  If you ride in dry conditions, the V brake is likely superior.  If you ride a CX bike mostly on road or gravel, the V brake is likely superior.  If you ride in gloppy sticky mud, a wide-open cantilever will take longer to cake up...and will be superior.