Warbler.But which one?

I'm pretty sure this is a Warbler.But I'm not sure if it's a Reed Warbler or Willow Warbler?
   There were two of them flitting across the water,catching Midges in the warm afternoon Sun!
   It was very relaxing watching them.There eyesight must be phenomenal as they were catching flies that were a good 12-15 feet away.I couldn't see them! 
  In fact I had a lot of trouble seeing the bird when it returned to the perch in the tree! Their camouflage was s o good.
   I feel very lucky to have got the shots really as I had been tweaking the sharpness of the Auto Focus on the D800.Just get that little better sharpness.But forgot to reset it before going out.Imagine my surprise when I opened up the files to find a good 100% improvement! See what you think? 
    I took a good 40-50 shots during an hour session.I was spoiled for choice as to which ones to show you all.