The only way you will benefit from lossless BD audio is with the 5/7.1 analog connects. The Sony cannot send anything over optical except the alternate audio streams, which will be DD at 640K or DTS-Core at 1.5M. While both of those are excellent audio quality, they are not “lossless” my any means.
But there are more wrinkles in this to consider. Your receiver very likely cannot apply bass management or DSP (decoding) to the analog inputs, it will be essential straight-through amplification with nothing more than volume control. This means that the player must be capable of doing some basic bass management on the analog outs, or even apply some DD decoding. If you use a sub and have your speakers configured as “small” this is an issue. If you watch 2-ch DVDs and want them to be decoded with something like DD-PLIIx, this is an issue too since your receiver will not be able to do this on analog.
Obviously, a lot depends on your intended listening and your preferences.