Hard to get Goldcrest

I chased this little character Around the garden,on and off,almost all day.Just trying to get that ONE shot! 
   They move just SOOOOO fast.
Managed this at 1/500 sec @ f8.
  A little dark and one hell of a crop.Shot @ 4800 x 3200 and cropped to 1000 x 725 ish. Detail still pretty good though? Proves the worth of a 36 mp camera?   lol 
  They are nesting in the garden so hopefully there will be other opportunities?