It happens to me also now, to decide whether i would buy 1D4 or wait for 1Ds4 or... just move to D3s nikon. Until today i still use my 5D2 for wedding. I'm very pleased with the IQ of 5D2 gives. Top notch with that price. Well, sometimes i found 5D2 is quite difficult to lock the focus in a for say, quite dark / minimum lighting around the object. And very slow focus-locked if paired with 100L macro. Then, i searched for D3S compared with 1D4, and from what i got so far, D3s is better than 1D4 in AF performance, IQ, pixel density, High ISO noise, and saturation, which are the important items for wedding photography (for me). If i have to move to D3S, i have to sell every single canon equipment and it's very painful. ~ L glasses ~ Well, Conclusion from me: IMHO, for myself, 1D4 is not worth buying.