Ghosh:
I'll toss an opinion in.
1. Think about image post processing choices before new lens. Try and use Canon's "Picture Styles." I find the contrast tone curves of the different choices reminiscent of different transparency films. "Neutral" with some adjustments is like Fuji Astia, "Standard" is like Provia or Kodachrome 64 black emulsion. The downloadable Styles are useful for narrow applications like Fall colors like slides, or cutting through haze. You can upload a few to the camera in addition to built in Styles. AND DPP is a FREE converter.
2. There is not much which is similar to the exaggerated primary colors and saturation of Fuji Velvia or EktaChrome VS. But, you can get close, and there are Plug-ins like Fred Miranda Velvia Vision, NIK, and others which make equally pleasing exaggerated tonal and density adjustments like Velvia.
3. Shoot in good light, White Balance with something like a Whi-Bal, and properly expose. Digital has same rules like with transparency film: under expose bright saturated colors in frontal light by 1/3-1/2-2/3 stop to avoid digital "Channel Clipping." When coverting RAW images, open them in ProphotoRGB or WideGamet RGB to avoid channel clipping. Make other adjustments to taste, then convert to smaller color space near end of workflow.
4. Lenses can affect color, contrast, resolving power, etc. Strangely, the first time I used the Canon EF-S 60mm macro lens and opened images, my brain said, "KodaChrome 64." Maybe I imagine it, but there is something special about this lens, and I keep a crop camera just to use it.
5. Shoot at f/5.6 through f/11 from a tripod. That will give you more sharpness punch than most lens changes.
Well, that's just one guy's opinion. Jack