Arthur, "upsampling" is simply a minor variation on the "oversampling" technology that all players have used for over 20 years. Neither of them can create real samples that aren't present on the discs. By inserting mathematically calculated extra samples in between the real ones a more gentle filter can be used on the output, and this is almost universally done, but the sound itself can't be improved in resolution by this.
More generally, despite what Alan and I reported, you still clearly are under the impression that a "high end" player can somehow extract more of the data from digital discs. You should be confident(although obviously you're not)that your Sony player, unless it's damaged, is getting everything out of your SACDs that's actually in them and no amount of money can work some audio miracle. The SACDs themselves might not be as good as you hoped, and your speakers and listening room of course are affecting the results.
