I cannot compete with the shooting power of the macro lenses here.
Just as a fun exercise, I decided to have a play with some close focusing of my "standard" lenses. That's the Voigtlander 25mm f/0.95 on the Olympus E-P1 which focuses down to a very useful 0.17m and compare that to my Nikon D90 and Nikkor 18-105mm zoom set to 105mm and focussed to its minimum of 0.45m. The results were interesting:
First the Olympus...
St Andrews Cross spider OV by
peterb666, on Flickr
Now the Nikon...
St Andrews Cross spider N17105 by
peterb666, on Flickr
Now some details:
The first photo was taken with the Olympus E-P1 and Voigtlander 25mm f/0.95 set to approximately f/5.6 or f/8 to get a fair bit of depth of field. ISO400 and 1/20s completes the photo specs. As stated, the distance was 0.17m which is the minimum focus distance for this lens. Only minor cropping when straightening the picture. I am very impressed by the detail of this picture.
The second photo was taken with the Nikon D90 and Nikkor 18-105mm zoom set to 105mm. The aperture set to f/16 which was necessary to get all of the spider in focus and it only just managed that. ISO400 and 1/20s completes the photo specs.
The distance was of course 0.45m. Now while this is 3 times the distance of the Voigtlander lens, bear in mind that the effective focal length of the Nikon is 157 mm compared to 50mm. Even so, a fair bit of cropping was required as well.
While I generally find the metering of the Nikon fairly accurate, it was way off in this. I applied +1EV compensation but still needed to bring up the exposure by over a stop in Photoshop. While the colour rendering of the leaves is spot on, and the out of focus detail fairly similar despite the quite different apertures, what surprised me was a very different colour rendering of the spider. I also had to apply a bucket load of sharpening to the spider.
While a very odd-ball comparison, I give this as a clear win to the Olympus E-P1 and Voigtlander 25mm f/0.95. On the plus side for the Nikon combo - I think the web looks better.
I wish someone would make a quality 2x teleconverter for MFT. That would make the Voigtlander nearly a macro lens. With a 2x converter and a 12.5mm extension ring, you would have greater than 1:1 and still have a fairly bright lens for focussing.