i5-4670k vs i5-3570k?

Solution
if you dont overclock go with the 4670k because it has better performance per clock
if you plan to overclock, go with the 3570k because it can overclock much better
Neither. If you're running stock, Haswell is slightly faster, but you don't want a k-edition processor.

If you're overclocking (*without delidding the processor, if you're that crazy), then Ivy Bridge is actually faster.


Here's Tom's Hardware.
Our first-hand information involves a high double-digit number of processors, including samples and final shipping boxed CPUs. Sort testing was limited to 1.2 V to keep heat manageable. Ring/cache ratios are pegged at 3.9 GHz, with the memory controller operating at 1,333 MT/s. Of the chips available for sorting, only one is stable at 4.6 GHz under full load. A few are capable of operating at 4.5 GHz. More run stably at 4.4 GHz. Most are solid at 4.3 GHz and down. As you stretch above a 1,600 MT/s memory data rate or a ring ratio to match your highest single-core Turbo Boost ratio (which helps maximize performance), your top stable core frequency tends to drop.

Overclockers.com guide to Haswell
The first thing you need to know about Haswell you already found out in our review (read it here if you haven’t already) – it runs hot. You will need a lot more than the stock cooler if you want to overclock. With a very good air cooler or all-in-one water cooler, you’re looking at a heat limited voltage cap of about 1.25 V. At that voltage with air or AIO cooling, you’ll be seeing temperatures in the upper 80′s to lower 90′s (°C) range under normal full processor load.

Tech Report's Review
Asus has tested hundreds of Haswell CPUs as part of its effort to profile the chip for auto-tuning algorithms. According to the motherboard maker, Intel's new hotness has a little less overclocking headroom than Ivy Bridge does. Perhaps more importantly, Haswell apparently has more variance from chip to chip, especially in the voltages necessary to hit specific speeds.
 

Szynergy

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If you go for the Hasswell (4670k) you can upgrade later to the new Gen. (Broadwell) that may be a advantage if you buy the i5-4670k. If you buy the Ivy-Bridge (3570k) and wanted to upgrade to Broadwell you'll have to buy a new Motherboard and probably new RAM and a new CPU-cooler
 


There is nthin announced yet that broadwell wud be using 1150 scket
 
There is no confirmation but looking on the trends its a yes
Ivy and sandy used 1155
Extreme ivy and sandy used 2011 scket
So probably yes but no official news
As well as the next gen broadwell cpus may be on ddr4 platform so it may have a differen scket