... and i'm afraid you will be corrected! The DMP-BD50 uses more advanced picture processing than the DMP-BD30, and is a better player all-round (as you'd expect for the £200 price-difference).
The Pioneer LX70A remains a slightly better performer than the Pana BD50, but no longer really justifies its price-tag - with its extra functionality, we feel the Panasonic is better value.
However, if you're happy with the Pioneer's spec, and can find a great deal on it (which wouldn't surprise me with three new Pioneer Blu-ray players just around the corner) you'll be buying a superb machine.