I'm pretty sure my AF has improved post FW 1.03. I've noticed less hunting in low light with my Sigma glass. I've also had a few episodes where the AF froze a bit when I purposely manually focused at infinity on a near shot (where it should have "zoomed" the AF to the near focus point). Now it just doesn't do that at all. I'm also fairly sure it tracks more accurately. Here's my Sigma 120-300 2.8. This is a lens where I dialed in +5 to get it sharper. Now I removed the AF fine tune and it's sharper than ever. I really think Nikon slipped in some AF improvements. These shots are on a monopod, high ISO yet they look better than some older shots on a TRIPOD. Crops are inset on each photo. Crops have ZERO sharpening and no noise reduction. Reduced images have minor sharpening: This one is most impressive bc I had so much trouble with the AF test "paper" chart (with the "focus here" line being blurry on all my tests with a TRIPOD). Look at how sharp the crop is at ISO 3200 with a MONOPOD and barely enough shutter for such close focus - 1/160: Here's the 50-150 2.8 II. This lens had slight problems at the close focus limit (very minor but there) and now it's just rock solid (meaning I can't make it miss focus). This is fairly close to the near focus limit - razor sharp - and not a shred of sharpening or NR on the crop: While it's entirely possible this is all in my head, I just don't believe it. Something has changed with the D300 AF. Anyone else experience this?