The leading lot at Sotheby’s, in their 25 January 2012 sale, was a drawing attributed to Piero del Pollaiuolo. California’s Getty Museum bought the drawing. The beautiful portrait drawing of a young man has been variously given to the Paduan school, Marco Zoppo, and to the Mantegna circle. The Sotheby’s entry on the drawing is very detailed and can be found here.
One of the works they compare lot 27 to is a drawing here in Rome at the Istituto Nazionale della Grafica. The Rome drawing is now assigned by the Istituto to Maso Finiguerra (a collaborator of the Pollaiuolo’s) although in the past it has been attributed to Francesco Pesellino, Antonio Pollaiuolo, and just simply 15th century Florentine school. The Sotheby’s cataloguers refer to the Rome drawing as by the Circle of Pollaiuolo. Just below is the Rome drawing and, at least to me, it looks as though it could be the very same sitter. Here is a link to the Istituto’s search form, where a better image of the Maso FIniguerra drawing may be found.