Bonsoir Gordon,
I see 4 groups I would like to check or see checked on the K20D over the K10D :
Group 1: main advantages
- resolution 14.5 vs 10 M pixels - more pixels at the expense of picture quality?
- CMOS vs CDD - how colour nuances are catched: remember the red affair and the red affair continues?
- expanded ISO mode - closer to HDR?
Group 2: welcome update to K10D limitations - improved shake-reduction - more reliable than experienced?
- improved anti-dust with dust alert
- improved AF - faster? more reliable?
- faster continuous shooting - the K10D delivered 3 images per second with a pause after the 6th: remember the ducks swimming?
- software ergonomics (menus) - K10D menus were difficult to navigate and poorly worded: is there an improvement?
Group 3: why not? - live view - does it work?
- digital filters with modes (like portrait, landscape)
Group 4: to be checked
- hue added to saturation, contrast, and sharpness - how complex it gets to set all these parameters: what I called once pre-processing?
- hardware ergonomics (buttons) - still as good as the K10D?
- twisted pictures - between sensor and viewfinder as on my K10D before repair
- learning curve for a K10D user updating to a K20D
Now, is the K20D worth upgrading
Sure, the K10D was (and is still) an excellent camera, so the K20D is very promising, with so many exciting new features like incredible resolution (if image quality remains as good, obviously

), new sensor technology and extended ISO.
Now, for obvious financial resaons, I can't update my gear every year

This year, I plan to get the DA* 60-250mm f4 lens. Maybe in 2010 I'll go for the K30D
If I were a professional photographer, main reasons for upgrading would be in group 1. Also, comparing the same picture taken with the K10D and then with the K20D will give the go
I stay tuned
Best regards from France,
_________________
--- rei_vilo
Pentax K-5 + BG4 + DA* 16-50 + DA* 50-135 + DA* 60-250 + AF-540FGZ
reivilophotography.weebly.com