As a lens, the new Tamron is splendid. In common with many mirrorless lenses some of the parameters, such as distortion and CA, are controlled in conjunction with the camera to get the best results, but the lens on its own is still an excellent overall performer.
Excellent central sharpness, Excellent edge sharpness, Nice bokeh, Excellent CA control centrally, Fast, accurate and silent AF, Moisture resistance, Effective Vibration Compensation, 5 Year Guarantee
Lens enormous compared to camera body, Edge CA obvious (correctable), Visible distortion (correctable)