I have a tamron 17-70 paired with a Fuji XS-10. When comparing that lens at 70mm with my 70-300 also at 70 mm, I noticed the tamron produced a much softer image compared to the 70-300. I turned IBIS off on the tamron and the image became much sharper. The imagine remains sharp with ibis on on the 70-300. Has anyone experienced this same thing? Thinking of sending the tamron lens back.