During the weekend, I revisited a AV store & tested the 42AL69 with some 720p & 1080p materials. With limited time, here are some of my personal observations:
The positives first. It's a pleasure to view this HD LCD esp with 1080p source. I'm pleased to say even under normal bright lighting condition in the store, its black level is really deep! So black that it appears like the LCD black frame. For 720p material, it is upscaled to the display native resolution 1080p resulting in satisfactory PQ. With 1080p, this is where the LCD PQ shines!
This LCD has good anti-judder but resulting in movies "film-like" become "video-like" (it looks more true-to-life). Some folks may not like this esp for Hollywood films. Such "video-like" effects will suit nature documentary e.g. Planet Earth, etc. I didn't check if this feature can be turn off/on.
So far the only negative I notice is though the unit refresh rate is at 120Hz, while playing fast scenes it suffers motion-blur. Yes, at fast action scenes it will become more obvious.
Overall, I still like this LCD very much though it's not perfect. At such price level, it's easier to overlook & forgive some of the inherited weaknesses.