Ciao Claudio
of course everyone would like one more stop "for free" (well, kind of, although in Italy I saw prices not THAT different from F/4.5 to F/2.8 and the same Zeiss proposes them with 200€ purchased online). Actually, I'd go for the compact (excellent performance and great compactness which I found to prefer over the bulkier lenses), but I've already realized you talked about the 2.8. From your nick, I guess you live in Tuscany... where did you find your samples? Aside ebay it's difficult to spot any store selling such items here!
p.s. just for the files I live near Parma