It's partly Nokia's fault. All their BS about Pureview taking over DSLR (in their ads) have disappointed people. Or in fact, they're right, a 1020 or 808 can replace a DSLR, if you didn't know how to use it (like 83% of tourists
).
Now back to settings. Variable aperture would be nice, but hey, it's a smartphone we're talking about. Keeping that in mind, what the 1020 allows is awesome to my eyes. I bought the 808 Pureview first and switched to the 1020 in March this year. I always have my phone with me and have replaced, not my DSLR (I don't own one) but my Lumix TZ5 by the 808 and now the 1020.
So I think it's a matter of half-empty, half full glass here. The gap between DSLR and a cameraphone is still there. But if we compare what the 1020 allows (with other phones or P&S cameras), then it is a brilliant device.
Now camera-wise, the difference between 925 and 1020 would be, according to me, not the lossless zoom possibility (I don't use it that much), but the size of the RAW it would deliver.
To return to the topic, I think the OP should wonder what is he expecting from a cameraphone/smartphone. Brilliant P&S capabilities? A more digital approcha: whether it replaces a DSLR and fine, whether I don't need a cameraphone?
Again, nobody that adding MP was increasing the quality of the image, nobody said that the 41MP product line (808 and 1020) would replace a DSLR, but because of Nokia's marketing about clumsy DSLR users and smarter 1020 photographers, it appears that some could have been lured when buying the 1020.
It's not a problem, if the OP refines his needs and understands explicitly what he expects from his phone. All other comparison (925 vs 1020 vs DSLR) is futile to my mind.
Final point: if I were you, I would keep the 1020. You'll lose with a 925 the Xenon flash and 16GB of storage without being sure that your battery life will be improved.