Yah, of course my BW cannot compare with the Pro's, cos I am not a Pro.:bsmilie: I am a newbie still learning.
But to be fair to the channel mixing technic I have to say this, when you do channel mixing, then you can tell the diff from normal BW direct from the cam.
Contrast for BW is not always there unless there is really a luminance contrast in the real scene, if not, even if you use a SLR BW film also cannot get the contrast (ie. if you take a BW pic of a 2 pieces of paper with similar luminance , you won't get the contrast). That's why even bw SLR users need to use colour filter to get the required contrast on their film......
The "storm" pic didn't have much contrast is because even in colour, they are the same hue, so where to find much contrast? If you look at my changi airport recycle bin pic, the three bins are in 3 diff colour actually. I manage to get the 3 tones of the 3 bins in such contrast with channel mixing (can mix in RBG mode, same principle as using colour filter on BW SLR). If you use BW mode on your cam, you will probably get the 1st and 3rd bins will the same tone. It was after this trial then I told David that channel mixing is really good.....

Still learning.....learning......and will share here for those interested of my experience.
Any experience to share on BW?