"The current and slightly updated G2 version (model A025) will also be reviewed, soon."
Not sure if the revamped lens construction can be called just slight (even though the two do have a resemblance)?
"There is no dediated dedicated mode for panning, you'll have to rely on the lens to reliably detect panning movement."
"The actual amounts are fairly low, though, less than most competitors" Comma after though is not needed.
"Vignetting and CAs are well controlled, bokeh quite smooth for a zoom lens and distortion, while still present and visible, below average for this lens class."
I would prefer an "is" after bokeh, as now it harks back on the "are" from vignetting and CAs.
"Build quality is very good and nothing really to complain about, even though in direct comparison to Nikon's and Canon's lenses in this market segments it feels a little less sturdy."
Rather: "Build quality is very good and even though in direct comparison to Nikon's and Canon's lenses in this market segments it feels a little less sturdy, nothing really to complain about."