You keep talking about the 15" model when the OP specifically stated in his first post that he's talking about the 13" MBP. It seems that you'er trying to re-direct the conversation to prove your point.
First comparing the 13" rMBP to the 13" cMBP: The CPU, GPUs, SSDs and RAM are all faster. The battery lasts longer. The screen has a higher resolution. It is thinner and lighter. This is all measurable and based on facts.
Now, comparing the 13" cMBP to the 13" rMBP: You can upgrade the RAM and HDD. The battery can be replaced at a lower cost. Ethernet and FW800 ports are available. This is also factual.
You obviously place higher value on upgradeability than performance. That is fine, but it's subjective. Myself, and many others, place a higher value on performance. I'm not saying I'm right and you're wrong. I'm saying that you're preference for one over the other is based on your needs.
You are right, that I proved that teghere is nearly ANY REAL LIFE ADVANTAGE concerning the 15" cMBP vs nMBP.
You are right that the OP is looking for a 13". But I talked also about 13" (see weight, Dimensions and PRICES).
The reason for that is that we were also discussion a little bit the overall-Tendency of MBP program.
YOU rated that the new 13" is faster, has less weight and is thinner.
No offense, but it is a little bit like Jonny Ive in his infamous Videos claiming "We worked haaaaaaaaard to get the thiiiiiiiiiineeeeeest MBP EVER!" .
What counts is HARTD DATA.
So lets have a look at "performance data (again: Source is everymac.com).
(The difference is even LESS than between the 15" cMBP and nMBP
So many thanks for demanding the 13" data
)
new 13" MBP 2015:
Introduction Date: March 9, 2015 Discontinued Date: N/A
Processors: 1 (2 Cores) Architecture: 64-Bit
Geekbench 2 (32): 8480 Geekbench 2 (64):
9632
Geekbench 3 (32): 3093 Geekbench 3 (32): 6446
Geekbench 3 (64): 3415 Geekbench 3 (64): 7259
-----------------------------------------------------------
"Old" 13" MBP of 2012:
Introduction Date: June 11, 2012 Discontinued Date: October 22, 2013*
Processors: 1 (2 Cores) Architecture: 64-Bit
Geekbench 2 (32): 7841 Geekbench 2 (64):
8406 (= 14,6% less than 2015 model)
Geekbench 3 (32): 2930 Geekbench 3 (32): 5979
Geekbench 3 (64): 3239 Geekbench 3 (64): 6708
Processor Speed: 2.9 GHz Processor Type: Core i7 (I7-3520M)
The Performance is nearly the same - you will shurely not claim a plus of 6-15% being significant, do you?
BTW:In nearly all reviews there has been statements that the performance has not much changed.
As for weight: even better for the 13" models: (if you compare same equipment: NO optical bay and 1TB SSd plus 16GB RAM): nearly zero ( Optical bay -335g, HDD replaced by SSD -100g: total - 435g) . classic MBP 13" in minimal version just 425g more weight, after upgrade even with new MBP.
So - Do you still claim the new one is
SIGNIFICANTLY
a) Better performing
b) Weights less)
c) has significantly better "form factor" (However your definition of that might be?)
and the most important point:
Who does waste money? Customers buying new or old MBP?
You can now add all other above cited data I presented already in former postings…
If someone loves to burn money for little to none advantage: NO PROBLEM for me!
BUT: NEVER claim there are a t least significant or even enormous differences that matters in real life between updated classic and new 13" or 15" MBP. - well - except PRICES …
They differ significantly (one being double the price of the other) and and hurting…
Agree?