New iMac 20": Entry Level LCD Panel!

First a report from Arthur:

I had a rather bad surprise couple of days ago when starting using my iMac Alu 20" received last Wednesday. Yesterday morning, while displaying a RAW photo with Lightroom, I was surprised by artifacts, similar to those seen on compressed JPEG with blue sky. Then I forgot about it. Till yesterday evening when I displayed a gray to white scale with Omnigraffle... big shock! I obtained large stripes, with ugly sides...a disaster...
So I decided to display a white to black scale, and photos below illustrate the astonishing result. On the white side, the first 5 centimeters on the left are entirely white:

And on the right, the last 5 centimeters are fully black:

And in between one can see those vertical stripes of 1cm with ugly sides.
I started looking on the web, and with our friend Kiryu, we found the reference of the LCD panel being used in the new iMac 20" Alu from Kodawarisan. It is a TN panel, encoding colors in 18-bits (6-bits per RGB layer), instead of 24-bits for the previous 20" iMac, or the new 24" iMac Alu (IPS or MVA panel).
Of course, I can not make any use of this new iMac 20" Alu for my photo business, so I will try to negotiate with Apple to get It exchanged with either the previous iMac 20" or the new iMac 24" Alu. I screwed myself as I could not imagine Apple could have changed so dramatically the quality of the LCD panel used in iMacs.

Of course, if you purchase today the new iMac 20" for 1199€ (all taxes included), it will be a perfect companion for most users. However, if you plan to use it as a photo editing/reviewing platform, or more generally if you need support for 24-bits color and a wider view angle, then go for the new 24" iMac Alu, or the previous 20"/24" iMacs.
One can indeed regret that Apple is not providing enough details regarding components being used in hardware models (LCD panel, true CPU/GPU specifications, etc.)