I was reading pgtips reason why he switched to Pentax and thought I'd post my observations here as well.
Before finally deciding on my 1st DSLR someone suggested I put together a lens kit for each. My requirements were an allroaund f2.8, an f4 telephoto zoom and a 50mm prime. I had no idea beforehand what each manufacturer could provide.
This is what I came up with:
$ 750 Pentax 16-50 f2.8
$1,188 Pentax 60-250 f4
$ 617 Pentax 55mm f1.4
$1,000 Canon 17-55 f2.8 IS USM
$,1150 Canon 70-200 f4L IS USM
$ 300 Canon 50mm f1.4
$1,500 Nikkor 17-55 f2.8 (no VR)
$?,??? (please insert equivalent 70-200 f4 telephoto lens)
$ 450 Nikkor 50mm f1.4G
$1, 950 TOTAL (without telephoto lens)
If I add the the 70-300 f4.5-5.6 VR for $500 the price is similar ($2,450) but I do not know how the quality compares to the Penatx or Canon telephoto zooms. Also the 17-55 f2.8 has no image stabilization. (for the f2.8, Tamron 17-50mm VC could be used for both Canon or Nikon @ $600).
As I struggled to get the Nikon lenses to match up to the kit maybe 3rd party (like Tamron or Sigma) is the way to go for them.
It seems like Pentax are very competitively priced and has a great range.