Sigma 100-300 f4 APO vs. 80-400 OS?
I currently have the Sigma 100-300 f4 APO lens which I and others feel is perhaps Sigma's sharpest tele zoom lens but would like a little more reach. I do use it occasionally with Sigma's 1.4x TC. Since I always use the lens on a tripod or monopod, I'm not affected too much by the weight of it. Having recently discovered the benefits of IS on several Canon lenses, I am wondering how the OS of the Sigma compares but more importantly how the sharpness of the 80-400 stacks up against the performance of the 100-300. Can anyone help me out with this?
Thanks in advance for your help!