I bought this TV (52WL140) a week ago so I am interested in the outcome of this discussion. I bought the TV assuming it had the Bravia 2 engine, based on the sony.ca website.
However, after checking sony.com, I became confused (sony.com lists the 52WL140 as only having the Bravia engine, and not Bravia 2). So, I called Sony this morning to ask their assistance. After some checking, their reply was "not sure". Some of their documentation stated it had the Bravia 2, while others stated the older Bravia engine (however, I found Sony is very inconsistent in their usage of the Bravia 2 inclusion -- some places for the same TV they'll state Bravia, and others Bravia 2). Sony advised they'll get back to me on the answer. While they couldn't answer the question, they did acknowledge the confusion on their marketing materials, and promised to get me th eanswer.
I checked the box in which the TV was shipped, and it states the 52WL140 has the Bravia 2 engine, and also I found a sticker that was on the TV that also said Bravia Engine 2 (BE2).
So, I'm cautiously assuming the 52WL140 has the Bravia 2 engine.
The only other difference between the 2 TV's is the finish. One is glossy and the other matte (hard to tell which is which).