If you're using Mac, why don't you switch to iPhone?

The screen is too small. I do a lot of reading on my phone and my current 4.3" screen is just a tad too small.

I am and always have been a Samsung supporter. The Galaxy S4 is my ultimate phone of choice as I have had Galaxies before and a Samsung Infuse.

I've yet to own a Samsung phone. I've only had HTC and LG. The Nexus 5 will be my first LG smartphone though.

What about iOS on Android? i found it last day on an AD, http://iosonandroid.com/download/
Haven't tried it though, and i won't. I Don't like iOS, OSX Operating Systems i stick to the Unix and Windows OSes.

Or even better an Android Phone , with JoyOS 1.2.2 flashed in it, :P Its 100% look like an iphone, though it nowhere near close to an iphone.

Or even iPad Mini,

I never liked iPhones. I believe Price/Quality does not worth at all. I mean you pay a lot for a small quality of hardware.
Also beeing a closed source operating system, doesn't give the ability to the developer for further development and improvment , something that makes the phone completely obsolete in time...

Edit: Small Comparison: http://www.phonearena.com/phones/compare/Sony-Xperia-Z1,Apple-iPhone-5s,Google-Nexus-5/phones/8000,7710,8148

I haven't personally seen iOS on an Android, but have seen the opposite on an iOS device. Personally, I'd like to see how Ubuntu would work on a smartphone... I just don't have a spare smartphone lying around...

iPhones are overpriced, overrated and their quality is unjust. I've owned one before and it broke within less than a year of ownership. I've had plenty of Android devices and they've met every single qualification that I needed in a device.

I wouldn't run iOS on anything but Apple hardware. It's not supported and I doubt it would work very well. I think iPhones and iPads are nice devices, but they've yet to release something that suits my needs. I don't need a wifi tablet because I've got my computer and I prefer a larger screen on my wireless data device. I'm waiting for a 5in+ iPhone, but even if they released one I doubt it would be affordable. You really can't beat the value of the Nexus 5.

Sony Xperia Z1

Not a big fan of the look of the Xperia Z1 and I just don't think the extra cost is worth it for the better camera. $600 vs $350 where both phones have a similar screen and fast processor.

Its also waterproof , accept sd card, has Fm radio, glonass
Its much more than the cammera

Fact is that it's expensive , though if you wait 4-6 months, it will be like the Nexus 5's price.

And if you wait 4-6 months the Nexus can be purchased for $200 or less. Waterproof is interesting, but I don't think I'd need that. I've never dropped a phone in water.