There is no point in comparing bridge camera and DSLR. They used to be popular in early 2000s, but when affordable DSLR appeared, they felt out of favor. I went through the same route nearly 10 years ago – I was choosing between Panasonic FZ30 and Pentax *Ist DL. I've read all the forums and they all were like "don't buy bridge camera, buy DSLR instead!". I chose Panasonic. Only 1 year passed, and I went buying Pentax K10D DSLR. The Pentax was overwhelmingly superior to Panasonic in image quality, but you need lenses for it. My strategy then was to use fast primes on Pentax and keep Pany for long telephoto reach. But when I tried old Russian 200mm manual focus lens on Pentax, I never looked back. Yes, you could zoom all the way to 400mm on FZ30 and it has autofocus, but images from that old lens on DSLR were much more pleasing, that I would rather cope with manual focus and shorter reach, than use bridge camera.
Anyway, FZ1000 is impressive revival of FZ line, tried one in shop, FZ30 is a toy compared to it,
but: Originally posted by irishnutter IQ competitive to APS-C at least at lower ISO
Unless you are happy with jpegs straight from the camera – no. Heavy post-processing on images form smaller sensor will bring out more noise and tones will degrade more even at low ISO. And dynamic range cannot be too wide even on APS-C. Are you sure you won't need high ISOs? At 400mm, they will come handy.
Originally posted by irishnutter FZ1000: also good ergonomics
Questionable. They combined zoom and focus to the same ring, so in manual focus you have to switch modes to zoom or focus. Zooming with ring is electronically coupled, that means fixed max zoom speed – on FZ30 you could zoom from wide to tele instantly.
Front element of FZ1000's lens is so big there is going to be no good tele or wide converters, or they are going to be expensive.
Bridge cameras are in awkward position – too big and expensive compared to point'n'shoots, too limiting and inflexible compared to system cameras. So many choices these days: don't like weight of DSLR's – plenty of mirrorless to choose from. Zooms with very wide range are now available for DSLRs. It will cost more to cover such range on system (DSLR or mirrorless), but it's going to be more future-proof and will go a long way along your learning path. Bridge cameras like FZ1000 are fun to use, but considering their price and capabilities, they are kind of extravagance.