You still ignore your own source saying:
“Reception is absolutely definitely improved,” AnandTech wrote. “I felt like I was going places no iPhone had ever gone before. There’s no doubt in my mind this iPhone gets the best cellular reception yet, even though measured signal is lower than the 3GS."
The question is reception. Is it good? Your own source says far better than the 3GS despite the chart of relative attenuation. Do you leave that out on purpose?
See several posts in this very thread (15 and 20 for example), and many, many others.
In some cases, the iPhone 4 can have better reception; however, it's proven to drop reception when 3GS phones would not. That's all over the Internet, Youtube videos, etc.
Just try to explain this:
Phone on desk, phone held, phone held in case. Cannot upload when holding the phone. Oops.
Apple - even Steve Jobs - tells you to hold it differently. Oops.
Apple recommends a case to help reception quality. Oops.
Apologists for Apple just won't accept any potential for any problems ever for any Apple product, though. Right fanboi? ;)