[T-Mobile Samsung Galaxy S II SGH-T989] zealtor:
As a former T989 owner and a current nexus 4 owner, this thread makes me laugh (and I was running AOKP jellybean on mine). Don't get me wrong, I loved my hercules and it is still a great phone, but let's be realistic here. The nexus 4 is hands down a better device in almost every way possible.

Screen

The display is far from "carp". Yes, if you are used to AMOLED displays (like the one on the T989), you will initially find the colors to be "washed out". But in reality, this is because AMOLED screens have grossly over-saturated and unrealistic colors. The blacks are not as deep as AMOLED but they are damn close (again this is due to the nature of IPS displays). Nexus 4 screen is much much sharper, the whites are actually white (and not blue like the one on the T989) and colors are more natural. There is a reason why most reviewers rate is as one of the best displays on any phone. IMO, there is no competition here.

Performance

Again, there is a big difference here (even with JB on the T989). Nexus 4 is smoother and snappier in general use. But heavy usage like gaming is where the biggest difference lies. As for benchmarks, the lower than expected scores are due to benchmark programs not being optimised for 4.2 (go see the difference between the new and old version of Antutu). And honestly, in reality, benchmarks don't mean s***. All I need to know is that this phone handles everything I throw at it without any hiccups and certainly much better than the T989. If you think that a two gen old dual core with 1 Gb ram preforms as a well as the current top end quad core with twice the ram, you are delusional.

Storage and battery

Storage is the only area where T989 has an advantage with its micro sd slot. If you are the type of person that needs to store all of your life on your phone then nexus 4 is not for you. Personally, I barely store anything on my phone (I had used up only about 4 gb of the internal space on my t989) as everything is on the cloud, so even the 8GB nexus 4 is more than enough. Again this is a personal thing so it's a disadvantage for some people but not others.

Battery life for me has been much better on the nexus 4 than on the t989. Obviously, everyone's usage is different so this will vary from person to person, but I'm extremely happy with mine.

Build quality

Here again, there is no competition. The nexus 4 has a much more solid build and has a very premium feel to it. My T989's plastic back started to creak like crazy just after a few days of owning it and it drove me crazy. I thought I was using a low-end entry level device rather than a premium product.

Yes the nexus has a glass back and yes glass cracks when you drop it...who knew huh? So if you are the type to drop your phone frequently, don't buy it or just get a case for it, end of story.

As for the problems being reported, very few newly released devices are without issues and this is a fact. T989 had it's fair share of problems, some of which have still not been fixed till this day (sticky power button anyone?). If you are someone who can't handle even a minor problem with your device, than a newly released phone is not for you (whether it be a nexus 4 or something else). And let's not forget that problems reported on online forums can be blown out of proportion. After all, only those who have issues are going to complain, while those without issues will probably remain silent. Personally, my nexus 4 is flawless, except for the slight static/buzzing problem from the earpiece reported by many people. However, this noise is very faint and inaudible during calls, so this is a non-issue for me. I'm confident that google will fix the issue and when they do, I will ask them to send me a replacement. After all, that's what the warranty is there for. In the mean time, I'm really enjoying owning this phone over my t989.

Oh and let's not forget about the pure android experience and the fact that you will get updates as soon as google releases them. Even if you are into modding, the nexus is the best phone for that as well as its modding community has always been the strongest out of any android phone. You guys really need to step back and look at things objectively here. As someone who has owned and lived with both phones, I can tell you that there is no competition between the two.