Honestly, both lenses were fantastic. There was drift, and with the drift, the Sigma came out behind Sony, but it still comes out ahead of many other prime lenses I regularly use perfectly focused manually with focus zoom -- certainly nothing to disqualify it from real life use. We're talking about really small issues with both lenses.
|Morning At Picture Lake by Buzz Lightyear|
from Dawns first rays
|AT-6 Harvard by jarud|
from Trainer aircraft
|Matterhorn by ewng|