I continue to get some chromatic abberation with the kit 20-60 with my S5 and more recently noticing quite some barrelling, especially at 20mm. Now the 20-60 is a good lens but I'm thinking of trading up to a better general walk around lens, such as either a 24-70 2.8 (either the Sima or Panasonic) or a 24-105. Wondering if anyone has any experience of using both (a) 24-70 and the 24-105 and interested in your thoughts - as always there is balance between constant aperture 2.8 and 4 and the oft handy extra length. You can only have one, 20-60, 24-60 or 24-105?