Hi all! 
Just sold my 80-200 f2.8 and bought 70-200 f4 VRIII ! 
No regrets on focus and sharpness ! 
For me VR mattered for the type of photography I do ! 
This lens is a blessing for its weight and fast AF! Edge to edge sharpness even on Tele end ! 
I have kenko TC pro DGX 300 1.4x which is used with 80-200 successfully! This is also ok on my new 70-200 f4 copy but I noticed that it makes a humming sound with VR ON ! 
Can't decide if this is due to third party TC or just that Kenko TC amplifying the VR humming ! I can feel some little vibration in hand holding the lens! Any comments friends? 
