Nice work! I love it when I get a shot at a new (to me) species.
I hope to be able to get more warblers this year -- They pretty much seem to blow through this area on their way to their much preferred largely wooded areas way north of here. Hopefully, I've found some spots where I stand a chance of getting some shots either in the coming month or two, or when they return in the fall. I think that the advantages that the K20 offers in resolution and focusing speed/accuracy will allow me to add a few more species to my collection.