The Z-twist in the yarn (see Jan’s post #6) and deliberately twisted sts can give a similar look. If you examine the point of the V you can tell the difference. In the case of the twisted sts you can see where one strand of the V overlaps the other. This doesn’t happen with the Z-twist yarn.
Here’s how to do a twisted k or p stitch which makes a nice decorative stitch and tightens up ribbing.
http://www.lanagrossa.com/service/stricktipps/stricktipp_verschraenkte_maschen.html