I Shoot pro sports and music the advantages of using this camera with a 200-600 going into crop mode and still have 20 mp when downfield from the action and yes I have a 400 2.8 and with a 1.4 ext was my go to lens but the 200-600 changed that when I am not in a dome. For music think of this you can get the drummer in cropmode with a 70-200 or 70-180 that tamron is nice. glad a tleast they kept the grip from the A9 mk11 . The 400 sync is also a welcome addition. Now if they could only have smaller less megapixel raw files i would sell all of my a9 mk 11 but alas they ave not done that yet. a9 mk 11 with wide and mid zooms and the A1 with the tele.