I am using SX130, older version of SX150. I am happy with it. I have posted more than 50+ photographs here in this forum. You can check that, but it's little difficult to locate them. I have uploaded very few images in flickr check 'em yourself.
This link will take you to my flickr page.
*www.flickr.com/photos/surauna/page2/
This link will take you to photographs taken using SX130
*www.flickr.com/cameras/canon/powershot_sx130_is/
SX150 is not a huge upgrade from SX130. So the images of SX130 would be as good as SX150. SX130 was selling @10995 before discontinued, now the upgraded version is selling at even lower price.
When I was exploring, I was really surprised with the images taken in the compacts like A1200, A800. They were so good. We have to accept that fundamentals/art of photography is the primary thing than the photographic equipment.
Answering to your question, In my opinion "No, it's not compromising on image quality".